I did a very long cubepro conversion and I think it worked out, unfortunately my print bed got destroyed during calibration and I am looking for a new one at a good price. I live in the EU.
I have the motherboard if anyone wants.
Ebay - itm/332983919976
(cant post links yet)
I'm in the process of converting myself, what controller did you end up getting? I'm thinking of doing a Duet system
Im thinking im going to grab a duet board or a clone tomorrow and attempt at finishing my project.
If OEM spec is something you can be without check out the Cubenstien build on this forum, he appeared to attach an aftermarket 300x300 print bed to the stock Z axis chassis