Are these tubs okay?

Hi, all. I'm still in the process of planning my PVC snake rack, and was hoping you could help me stop agonizing over which tubs to use.

The two tubs I'm planning to use are:
Sterilite 28 quart (23 x 16 1/4 x 6) and
Rubbermaid 15 quart (16.9 x 13.4 x 5.4)

These are the snakes I'm planning to house:
Male Kenyan sand boa (15 quart)
Female western hognose (15 quart)
Year old male BP (15 quart)
Year old mussurana - he's still tiny (15 quart)
Year old Mexican black kingsnake (28 quart)
Adult male BP (28 quart)
Year old Northern pine snake (28 quart)

I figure the hognose and sand boa will permanently live in their 15 quarts, but the mussurana and young BP will eventually get upgraded to 28 quarts. It's kind of nerve wracking because ideally I could mix and match the tubs, but the 28 quart are taller than the 15 quart...! Any suggestions there?

Can you not edit your own posts here? ._. It's driving me batty.

Anyway, I'm thinking instead of following Simple Man's tutorial, since his tubs are all the same height. I'd be using the Sterilite ClearView Latch 15 quart and 32 quart respectively, instead of what's mentioned above.