Unit IVModel Making

Cutting, Joining & Finishing

The techniques that turn material into a model.

≈ 55 min + technique practiceByAmogh N P· Architect & interior designer

This is the making itself. Learn accurate cutting — multiple light passes, never one forced deep cut — and score-and-snap; joining with butt, mitre and self-jigging tab-and-slot joints, dry-fitting square before glue; the right adhesive for each material and its pitfalls (PVA is foam-safe; solvent glue melts foam; superglue fogs acrylic); and finishing, where you suggest materials rather than replicate them, matte over gloss, and photograph the model at eye level.

Learning objectives

By the end of this lesson, you will be able to — mapped to the course outcomes for Model Making:

CO4 · Apply

Cut accurately with multiple light passes, and cut openings and curves.

CO4 · Apply

Join with butt, mitre and tab-and-slot joints, dry-fitting square first.

CO4 · Analyse

Choose the right adhesive for each material and avoid its pitfalls.

CO4 · Create

Finish, texture, base-mount and photograph a model well.

Accuracy first

Cutting & joining

Multiple light passes and score-and-snap, the butt/mitre/tab-and-slot joints, dry-fitting square, and choosing the right adhesive.^{[1, 2, 3]}

DiagramAccurate cutting — multiple light passes not one deep cut, and score-and-snap for thin card

DiagramModel joints — butt, mitre and self-jigging tab-and-slot — and dry-fitting square before gluing

Light passes, not one deep cut

The foundational skill. Use MULTIPLE LIGHT PASSES, never one forced deep cut — the first pass scores a shallow track that guides the rest, giving a clean square edge, and it is safer. SCORE-AND-SNAP thin card (and scribed acrylic): score firmly, then snap over a straightedge. Keep the BLADE VERTICAL (90°) for square edges; let weight, not force, drive it. For CURVES, use a fresh pointed blade and short strokes, rotating the work. Cut OPENINGS (windows, doors) marked on the flat piece, inner waste first, BEFORE assembling the box.^{[1, 2]}

DiagramWhich adhesive for which material — PVA is foam-safe, solvent glue melts foam, superglue fogs clear acrylic

Suggest, don't replicate

Elements, base & finishing

Building floors, walls, removable ceilings, stairs and furniture; the designed base; and finishing, texture, lighting and photographing.^{[1, 4]}

DiagramFinishing — suggest materials rather than replicate them, matte over gloss, and shoot the model at eye level

Floors, walls, stairs, the base

Cut the FLOOR from the plan as the base for wall registration; cut WALLS as flat elevations (openings first) and glue them up square; make the CEILING/roof REMOVABLE for a cutaway so the interior stays visible. STAIRS — the signature detail — build as a stringer-and-tread assembly or a stacked/laminated method, riser and tread scaled from real dimensions. Reduce FURNITURE to essential blocks refined only to the resolution the scale earns. The BASE board is part of the design — rigid, flat and true, with a considered margin, the model fixed down, and a title/scale bar.^{[1, 4]}

Myth vs reality

At a glance

Aspect	One side	The other
Cutting	Myth: one firm deep cut is accurate	Reality: several light passes — cleaner and safer
Glue choice	Myth: any glue works on any material	Reality: solvent melts foam; superglue fogs acrylic
Finish	Myth: more colour and detail is better	Reality: restraint and matte read as sophistication
Materials on a model	Myth: reproduce the real material	Reality: suggest it at scale (texture, print)
Photographing	Myth: shoot top-down to see all	Reality: shoot at eye level for real space

Vocabulary

Key terms

Multiple light passes

Several shallow cuts guided by the first scored track — cleaner and safer than one deep cut.

Mitre joint

Both mating edges cut to 45° for a clean, thickness-hiding corner.

Tab-and-slot joint

Interlocking cut tabs and slots — self-jigging, square, and the laser-kit standard.

PVA vs solvent glue

PVA is foam-safe; solvent glue melts polystyrene foam — the material dictates the glue.

Suggest, don't replicate

Represent materials at scale (printed texture, matte paint), don't reproduce them.

Eye-level photograph

Shoot at the model's scale eye height for a spatial view, not a top-down toy shot.

Apply it

Making task

Cut and assemble a single test corner of two foamboard walls: mark and cut each wall with multiple light passes, mitre the corner at 45°, dry-fit it square against a set square, then glue with a foam-safe adhesive and hold it until cured. Note which glue you chose and why (and which you avoided). Then finish one small wall panel to represent a real material — brick, timber or concrete — by suggestion, not replica, and photograph your corner at eye level against a plain backdrop.

Check your understanding

Self-assessment

1. The correct way to cut model board accurately is —

2. Which glue must you NOT use directly on polystyrene foam?

3. To photograph a finished interior model convincingly, you should —

In a nutshell

Recap

Cut with multiple light passes (never one deep cut), score-and-snap thin card, keep the blade vertical, and cut openings in the flat before assembly.

Join with butt, mitre or self-jigging tab-and-slot joints, always dry-fitting square before any glue.

The material dictates the adhesive: PVA is foam-safe, solvent glue melts foam, superglue fogs clear acrylic, too much PVA warps card.

Build floors, walls, a removable ceiling, stairs and block furniture to scale; the base is a designed, rigid, true part of the model.

Suggest materials rather than replicate them (matte over gloss, restraint over clutter), and photograph the model at eye level in natural light.

The evidence

References & further reading

[1]Nick Dunn, Architectural Modelmaking, 2nd ed., Laurence King, 2014 (cutting, joining, forming, finishing exercises).
[2]Criss B. Mills, Designing with Models, 3rd ed., Wiley, 2011 (construction technique and joint logic).
[3]Megan Werner, Model Making, Princeton Architectural Press, 2011 ('Tips & Techniques': adhesives, finishing, texture).
[4]Maureen Mitton, Interior Design Visual Presentation, 5th ed., Wiley, 2017 (finishing, presenting and photographing models).