Ah, I have a couple of photos in the last post in my build thread:
You should be able to see the excess tube sticking out towards the back and right hand sides in the last photo. I decided to keep all the excess sticking out on 2 sides so it can still be slid hard into a corner when not being used. I’m also still using the same piece of 40mm Triboard as a work surface, which has been great. That means the overall footprint of the router is still the same as it was when 600x600 but it’s noticeably stiffer in the smaller size and with the Primo parts instead of the previous Burly parts.
If I wanted to increase the size of the machine, I could loosen the truck clamps on the back and right trucks, loosen all the corner clamps other than the front-left one and remove the screws holding them to the bed, take the belts off and then slide it all out to its new size. Because I made the cables the same length as the tubes, nothing even needs to change length. I can re-use the belts because they’re way longer than needed and the excess is just wrapped around the legs and cable tied.