you can go 6 wheels with that plate too but it wont let you do a XY stage with 2060 or 2080. It will with 2040 or run 1 side 2060/ 2080and the other 2040. It also allows more movement on smaller lenghs of v slot.
I have already been designing this for my CNC router build. 2080 with steel plates on the sides. GT2 belt in this configuration with the polycarbonate wheels. I doubled up on the plates to make the universal plates "thicker" for this application
Please have a look at some of the examples included in the Build here under the Files and Drawings Tab. Also make sure to check out the discussions to join in and see how the community is using these actuators. - openbuilds.com/builds/nema-17-belt-and-pinion-actuator.7499/