I've modified furniture cabinets to successfully house snakes so I'm in favor of "thinking outside the box" & being creative when keeping snakes. I can see why you're looking at the space, dimensions, & price tag & thinking "why not?" But I question whether a grow tent would have enough structural strength for daily testing by an inquisitive snake, & a product that's just designed to hold plants may also have many sharp or abrasive edges inside- because they don't expect live creatures to be sliding around inside it. Whenever you use a product it's not designed for, the safety factor is on you.
Reading the product reviews tells you what many of the problems might be- ie. imperfect construction. But it seems like the only thing you'll be happy with is to try it & see. I hope you let us know how it goes. I really wish JP23 had updated their experience with this.
Afterthought- ever get a stuck zipper on your clothing? These zippers are going to get a lot of use- I hope they're up to the task, because if not, it would be awfully hard to fix.