So, quick little update, I've been advised to template everything out of cheap, equal thickness yoga mats, and build that to a 1 to 1 scale now, before hitting up the plastic again. Hopefully by doing this, I'll be able to get everything aligned, placed neatly and tidily, make notes as to what needs changing here and there, and so on and so forth. Thankfully I've got plenty of yoga mats to work with, considering this is the only thing I'd be doing with them, not yoga, haha.