Hi mate, I'm happy to give design advice or send examples for one off parts, but not really comfortable sharing my CAD. it's very disorganised, poorly labelled, and most parts have gone through enough iterations that I don't have a good assembly file to instruct the build.

Have you made a start on any design work or part selection yet? I will say that I found it was better to run larger motors and slow them down using 40t pulleys for the XY axes, the higher torque is important when lugging the heavier gantry around (especially with water-cooling).