This is a fairly accurate CAD model of the Anycubic Linear Plus frame. It doesn't have the effector, rods, linear bearings, or lcd screen, but it's a good reference for frame-related parts. Estimated tolerances for all parts are ±0.5mm, but some (like the injection molded frame pieces) could be more. Included file types: STEP, IGES, Creo Parametric files (ZIP folder), and STL.
If you have any suggestions or more accurate dimensions, comment what they are and I'll do my best to change them soon. Also, if you use this to make an upgrade, please mention it (or link it) in your part's description.