[velma]

I don't know about the sterilite bins to know if they're sturdy or not but I think the size is fine. It's about the same size as the tanks my Syrians are in. I'm sure someone can tell you if they're a good bin or if they're flimsy but just looking at the picture, I like the idea of the latch lid for security and I really like that the sides don't slope in like a lot of bins can. I look forward to seeing the end result. I think the trick if you're going to mesh the sides is not to go too low with the hole so you don't have to worry about the substrate falling out - but I've never made one so don't quote me on that! There should be some good inspo in the DIY section to help you plan your design & build it safely