did you allow for 3/16 beespace top and bottom of frames for the 3/8 bee space required-or
did you take a different approach-they look very fine--RDY-B
The inside dimensions are exactly the same as the BetterBee medium bodies. I think I have a photo (see link) of my version on top of the BetterBee box to show that relationship.
BlueBee, I got scraps of ¾ tongue and groove pine and ¼ pine plywood paneling from a person on craigslist. Because I got it free I laminated the ¼ paneling to the ¾ pine so it is 1 inch thick total. I decided to make the corner blocks 1 1/8 square just because. He, he, actually there were some dimensional variations and warpage in the ¾ boards so making the corner blocks 1/8 oversize hides some imperfections. That is an old carpenter trick. If you can’t make it perfect don’t.
I predrilled the holes in the corner blocks ½ in from the inside edge but if I were to do it again I would just put them in the center at 9/16.
If I didn’t have the ¼ ply and only had ¾ stock I would glue a piece 1 ¾ wide cross grain on the end of each side-board. Then make the corner blocks 1 ½ square. That would make your butt joints 1 ½ which will stiffen things up quite a bit. I wouldn’t try this technique on just a ¾ in butt joint unless you don’t move your boxes around.
BTW if you didn’t see it in the pictures I put a bead of caulk on every butt joint to fill in the imperfections and then scraped off the excess that squeezed out. Once that dries the joint will be solid. You have time to square things up a bit before that happens.