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Cut, measure and mark plywood

From the plywood, cut a piece 600mm high x 596mm (the width of the panel) for the back wall, three 582mm-wide x 300mm-deep floors, and four 400mm high x 300mm wide pieces for the sides and doors. Along the 596mm width of the plywood, measure up 200mm and mark the centre to cut a triangle for the roof front. Save the offcuts to make the internal walls.

Cut out roof triangle

Position the roof front at the top of the back piece as a template to mark out the top of the triangle, then cut with a handsaw. Smooth over all the pieces with 180-grit abrasive paper, removing any breakout from along the cuts, wiping away dust with a cloth.

Assemble the side and back panels

To assemble, use set squares with clamps to stand the side pieces up, run adhesive along the back edges, then position the back piece and secure with bullethead nails at 100mm intervals.

Tips: Tap the nails 20mm in from the ends to avoid splitting the timber, pulling the plywood into position as you go. When working with PVA adhesive, have a clean damp cloth on hand to wipe away excess as you go, to avoid drips and smudges.

Install base and rooftop floor

To install the base and rooftop floor, apply adhesive around the back and side edges, positioning them inside and flush with the end of the walls, securing from outside with nails.

Tip: Trim self-adhesive film to size with a utility knife and cover the floors before installing.

Affix middle floor

Install the middle floor by marking 200mm up the inside and outside of the walls. Apply adhesive around the back and side edges, tap into position and secure from the outside with nails.