(Semi) newbie here with many, MANY questions!

[Snagrio]

I have a bioactive enclosure so I obviously use loose substrate, if you are worried about ingesting you can cover the top layer with large leaf litter and when feeding you can put them on top of a plastic lid in the enclosure or something that isn't the substrate but some snakes won't eat even after just being moved in the enclosure a little. The way I think about it is that they digest bones so a bit of soft substrate probably isn't gonna be detrimental.
Also remember that they need higher humidity when shedding so the substrate has to be able to handle this.
I'm sure you know but don't use pine or cedar or any wood that secretes oils, even kiln dried is risky!
One last thing (even though you haven't mentioned it) I wouldn't recommend aspen, even though they live in a pretty lowish humidity place they spend basically all their time in more humid places like rodent burrows and stuff - it also rots really easily!

No worries, already know to avoid those and am aware of the aspen controversy (at least as far as BPs are concerned). Thinking what I'm going to do first, is after I get everything I need, set it up to test with newspaper first and see how that goes with maintaining humidity and if it doesn't work out and requires repeated upkeep at a frequent pace, I'll go with coconut fiber as the backup plan.

While on the topic, I need an opinion. Is this tub the right size and are the clips I put on the lid enough security or do I need to get a tub with the built-in clipping handles?

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Holes aren't drilled in yet since I want to make sure I can use it first.

EDIT: Darn I can't figure out this image system for the life of me.