So of your dont want to build a very long/tall 3d printer i recommend looking into building a flat long CNC frame for a laser/Plotter. They want to be long and flat, fitting your parts. I build a voron, several cartesians from scratch aswell as a giant laser frame. A Laser frame is much more simple compared to sth as overengineered as a voron(Perfection), far better suited to waste some spare parts with out getting lost in a one year project. Id have loved those rails for my laser.