Well here goes... Aluminium frame router design

[CharlieRam]

I have been looking at the X drive and have modeled up what I have in mind, I was originally thinking twin motors but I didn't want to tie up a 4th drive, so if I go for the following method would the belt length cause too much issue (I have worked out the belt length and the nearest standard length from Zapp is 1895mm) and also would a nema 23 do it or should I go upto a nema34. In the first image the belt is housed in a 50x25 3mm thich channel, in the second I have moved it up to show the belt run. This gives me about 2mm inside the box section in all directions clearance. Should I expect more belt sag or whip , I am hoping if they are tensioned OK then it will be sufficient but as I have no experience of using belt drives I have no Idea!
Cheers, Charlie