They will be loosely based on a Warre design, but I've made some changes for reasons too complicated to go into here. My internal dimensions will be 9.5 inches square, the boxes will be 11 3/8 tall with a 5/8 rebate (making the comb building area 10.75 inches tall) to hold top bars of the same depth. The sides will be 1.25 inches thick. If I get cocky with my woodworking skills I'll attempt windows as well.
This is a big deal for me as it is my first substantial work on the table saw. Frankly that beast scares me. I'm not the handiest of handy men but I am a careful and determined and once I had read and followed every possible safety precaution I fired it up and sliced the wood. Still have 10 fingers and no wood was launched into my body at half light speed.
Right now the only problem I see with this experimental design (I'm sure more will crop up) is the total height of the hive. 4 boxes, without a roof or a raised base will be 45.5 inches tall. Add a roof and a reasonable base and I'm looking at something potentially 6 to 6.5 feet tall.
I welcome considerate and respectful advice. I can think of one guy I don't want to hear from already! ;)