Versatile kit.
These are versatile kits, and don't have to be built as designed. You can cut them down, and otherwise modify them. Because of this, there is not always a guide for doors and windows on the back. This does make it a little difficult to put them in in some cases. IF Rix/Pikestuff was to need to retool these I'd suggest a grid system on the back that would aid in window & door placement.
