K40 Laser bed with steel plate

I wanted a rigid motorized bed for my laser so after looking at options i decided to make my own.

inspired by:
https://www.thingiverse.com/thing:2299337
https://www.thingiverse.com/thing:3073708
https://www.thingiverse.com/thing:1906231
https://www.holgamods.com/holgamods/Lasers.html

https://youtu.be/Bznpt6CiLvE

the corners are on their 5th revision and while things might change this is about as good as i can get.

the idea is there is 2 bearings and a collar in each corner desig