It sound's like you have thing's pretty much covered for a tub setup? What size is that uth? I'm using the same ones like your's till I get my flexwatt tape and helix. Are you buying a juvi bp or a yearling? If, your getting a juvi bp maybe for the time being you could find or buy a 15qt sterilite tub and set thing's up in that? The tub you described sound's alittle big for a new bp. Bp's like to feel secure so the less space they have the more it imitates the rodent holes from the wild.
Are, you using any kind of lamp with your tub? I use lamp's on my 60qt's since there much larger and wider than my 15-20qts. I also had to buy stronger basking bulb's. To help with the distance from the top of the tub to the floor. The lamp will also help with heat and day/night cycles.