Your post got me thinking, would it work if I made a stubby hive body out of 1x4 with frame rests and then instead of whole frames just use top bars with comb guides? That way if they wanted they could build on it and it wouldn't increase the height of the hive as much. Also a heck of a lot easier to build than a slatted board.Another piece of equipment to buy. I just place a box (super, deep, whatever) with empty frames on the bottom board and then the hive on top of that. If they draw on it, bonus. It saves having more "pieces" of a hive to have on hand when you are expanding. Still achieves the same benefit.
I was playing in my shop yesterday and built this slatted BB can anyone see any problems with it. I just ripped a 1x4 in half, put a 3/4" rabbet on 3 sides of the end pieces. The slats are 1" wide pieces of 1x4 and the plywood is 1/2". I placed it on a screened BB for example of how to use it. It was extremely simple to build and you can make 2 out of each 1x4 ripped in half. I have no experience with these so any advice would be appreciated.They can also be made using PVC pipe segments for the slats, wow does that use a lot of PVC pipe, but they work very well, too.