whoops, i linked to the large plans, not the small ones. i'm going off of this design. the tubs i have are 6" high. i'm probably going to have some blocks of wood inside the bins anyways for them to chew on/for the weaners to stand on to reach food/water.

the reason it's a headache is because i'm a woman and i can't figure things out unless i'm DOING them, lol. it would be a lot easier if i had the wood here with me, but i don't. also i have to figure it out before we go buy everything, because we live in an apartment and the table saw etc. is stored at my boyfriends grandparents, so it's really a big production to just build something like this.

i decided to support them from underneath because i've heard rails can sometimes be finicky and cause the lip of the bin to slip out, and that it's a hassle if you have to replace bins, because their lips vary in the manufacturing process.

would supporting them from underneath really be a concern regarding airflow even if i left adequate space? i was planning on 4 1/2" of space between the top and bottom of the next tub.

regarding water bottles, i already have 3 cages that i change bottles for, what's 2 more? because we live in an apartment, a flood would be a REALLY big deal, not willing to risk it. it'd be different if we were on the ground floor, but we're on the top.

ugh i still can't decide what to do.