Part of the problem is that even if we've seen a "grow tent" before, they vary WIDELY & all we can do is be a bit skeptical (in favor of what's best for the snake)
without SEEING exactly what you're intending to do. For me personally, I'm still a glass tank fan, & for what it's worth, I don't think storage tubs are any worse
for snakes that what you're trying to do with a grow tent, & they might even be worse...I'm just not a fan of plastics in general. But in the same way, I'd caution
you to find out EXACTLY what your grow tent is made of and what chemicals may remain on the surface that your snake can inhale or absorb*. There are many
things used these days, even in clothing intended to be next to OUR skin that can cause problems, & snakes don't have the size or the immune system that we
have. One reason I favor glass is that it's inert & doesn't off-gas chemicals...so what about these grow-tents? Manufacturers don't worry about health problems
or lawsuits when you're using a product in a way they did not intend...so please remember that. And I have a feeling that when people first started talking
about using plastic storage bins to house snakes there were just as many objections then as you're getting now.

I love "thinking outside the box" but just
don't forget that safety (health!) comes first over any advantages. I look forward to your updates, actually.
(*for example, the camping kind of tents can be treated with fungicidal chemicals, which are toxic...anything like that used on grow-tents? & remember brands may differ widely.)