Rack system switch...

Ok so this month and next I will be building a rack system. I am creating this to get a variety of opinions of what materials to use other than the obvious no no materials. As well I am trying to figure out what size tubs are Ideal for which species that I keep. Looking to grow allot more soon. Thanks for all the insight. :)

Just to update a list of what I currently have....

3'7" male normal
1'5" unknown sex normal
2' Blood Red corn
11" Anery corn
3' Dumerils Boa
5'5" Red Tail (my prized possession ;) ) thinking of making something a little more special than a rack for this one.

I have young BPs and they are in 32qt bins. I have young boas and a 5 foot in 41qt racks. When I move I will be building a 74qt for all the boas. Female BPs will be in 41s and males in 32s. Might get cages for boas seeing I dont plan to have more than a half dozen..