Geeetech i3 Pro-B X Carriage (with DWG)

I managed to wear out my X carriage on my Geeetech Pro-B and I hadn't managed to get a successful print of a spare prior.
I also find that when I download things I tend not to find a parametric file type I can easily modify. Meshes can be complex and are less accurate than parametric and many times people put up file types I'm not familiar with or are very program-specific.
So I've done a redesign and basic edit of a carriage. I took the dimensions off an STL and remade it in 123D Design. The files are as STL, Gcode and DWG (the common AutoDesk cross-platform). DWG should be easy to find an editor for as AutoDesk is one of the two leading companies in CAD.
The Gcode takes ~3-4 hours.
M3 bolt holes.

Printed one, came out rather nicely! Got so many print projects on the go I'm uploading this in a less customary way, will try and get a photo up soon! OR include any video I show it in.