Run a thin bead of glue along the top edge of one of the sides and clamp the top of the roombox across the top of the side, lining up the front and back edges and making sure the corner is square. Use two corner clamps, evenly spaced along the glue join (as shown in the photo above). Repeat with the other side and the bottom of the box. Wipe off any glue that appears from the edges of the join with a damp rag. Set aside to dry.
Run a bead of glue along all edges of the back of the box, and the unglued end of the box sides. Lay the back of the box on a flat surface and clamp the final edge of the sides to the base and top, holding the back of the box firmly in place. Check that all sides are square, wipe off the excess glue, and leave the box to dry.
When using pva glue on plywood butt joints it is important to apply pressure to the join while the glue dries.
Use an iron over a piece of silicone (baking) paper, or a teflon coated iron, to firmly iron veneer edging onto the unfinished plywood edges at the front of your roombox. Use a sharp craft knife to trim the edges of the veneer when it has set firmly.
Set your roombox into the picture frame for the front and check that everything fits correctly. If your roombox will have a frame, it may need feet on the underside of the back of the box, to balance the size of the frame on the front. Measure the depth from the base of the box, to the bottom edge of the frame and create two feet for the back of the box from scraps of plywood or appropriate sized wooden beads. To protect a shelf surface, glue a small bit of felt to the bottom edge of the feet. Don't glue the doors and windows in place until you have finished the wiring and the interior (and exterior) walls.
