@gwilki Another nice one! I don’t have the vortex but I’ve thought about the size limit some. Really, as I’m sure you know, your just limited limited by the Z travel in any one project as you can lift the mill or lower the table. The trick is to make that easy and stay square.
These are made for k40 lasers, I think, but maybe they will give you some ideas.
I like the top one myself and after building my LogMill I think making something like that could be done. Probably you’d just need bigger belts and pulleys to keep the lead screws synced up.
Cannibalizing an adjustable standing desk was another though I had. It’s all just pipe dreams for me ATM because I’m lacking the Vortex but I thought I’d share my thoughts.