Just nail some scabs on the sides of the 8 frame box. This works peachy. It reinforces the box and lets you use 10 frame bottom boards or change stack width on the fly.
I saw a 2x2 or 2x3 on a bevel and generate 2 scabs per piece. You need 1 1/4 inches or so. The scab can be permanent and give 8 frame boxes a "japanese" look when stacked together.

I saw a 2x2 or 2x3 on a bevel and generate 2 scabs per piece. You need 1 1/4 inches or so. The scab can be permanent and give 8 frame boxes a "japanese" look when stacked together.
