The bottom piece is just like the top but has a little style(maybe?). 2 screws hold it on, made sure you could get t the other screws without removing it.
No new thingiverse page yet, I still get emails with people asking why there corner blocks don’t look like the ones on the assembly page. I like making parts, hate taking pictures and all the rest of it. Keeping all this info up to date is hard. That and None of this is final until I finish the center. I might have to change the distance between the rails.