I came across this Youtube channel earlier, with videos of a 5 axis gantry type router CNC machine a guy in Armenia built for a friend of his. It’s not the fastest CNC machine (at least not in the videos I watched), but he sure did give himself a lot of travel! It has a tool changer (of sorts) and everything. It looks to be running on Mach3 software. It’s been said before– the only limits are your imagination. And how much steel you can get your hands on. I’m pretty sure that is implied. If I had time– and a shed– I’d love to build a CNC router like this.