In Part One I discussed the design. However, I didn't give you any detailed plans with measurements, mostly because I didn't know how accurately I could cut the foamcore.
For each base you will need:
1 x Base (5mm Foamcore) - 6" x 6"
4 x Long Corner (2mm card) - 43mm x 1"
4 x Short Corner (2mm card) - 41mm x 1"
4 x Long Corner (5mm Foamcore) - 36mm x 1"
4 x Short Corner (5mm Foamcore) - 31mm x 1"
8 x Tabs (2mm card) - 10mm, 1"
Don't worry too much about getting it absolutely accurate to the mm as the foamcore is quite forgiving. The card on the otherhand needs to be quite accurate as this is going to provide your overhang and ultimately a slot into which you can slide your door or wall sections.
It's a good idea at this point to draw over the pencil lines on the base with a ballpoint pen, otherwise it'll be trick to get a straight edge in the confined space once you've glued on your corners.
My trial and error provided me with several abortive boards with good square corners, so I just used one as a jig. This was invaluable and I would recommend making one. The corners are then hot glued onto the base. This is a bit of a messy job, but hot glue is way stronger than the foamcore's paper backing and provides a great bond.
Once this is done the doors and walls can be cut from foamcore. Doors are 3" x 2" and walls are 3" x 1", but can be trimmed down if they don't quite fit into the two slots at either side of an opening. This gives you the option of having a door or a wall in each side. Just cut more doors and walls as you need.
In my next part I'll be tackling the painting and decorating.