Thanks for the galv offer, do you know how thick it is by chance? I’ve seen some galv sheet that would be a bit too thin, and can could easily end up “non-flat” for want of a better term
Cutting out the camera hole will be easy enough, I’ve got a nibbler, so I’ll probably stick the sheet down then cut it in place using the routed hole as a guide. Won’t be perfectly, but should be good enough.
The rails are no-brand, but I think I got pretty lucky with these, they move very smooth. I’ve had many other sets of prismatic rails before, cheap and expensive, and I think it’s fair to say the problem with the cheap rails tends to be a lack of consistency and non-ideal cleanliness/lub. Some are less than perfect, but I think on the whole they’re generally pretty good. It does make me wonder if the terrible youtube videos about them out there are cherry picked, as I’ve never seen anything as bad as some of those.
Again this is purely personal opinion, but dropping $400 on the set of Hiwin rails for this system, while sticking with t-slot aluminium extrusion for the frame is a waste of money. I would think you’d end up with a better end result spending the extra few hundred on making a steel frame and having the mating bearing surfaces milled flat so the bearings are always running very flat.
For what it’s worth, this is the ebay listing I bought from, ~$100 for the three delivered: