I have an Ultimate64 too, I did this project for philosophical reasons, since everything is new, even the motherboard, it's definitely a new machine, but at the same time, if you look at the electrical activity on the traces, you would conclude it's a c64, and yet, there's no commodore chips on there.. The most commodore thing is the firmware which is on the UV EEPROMs, and even that is slightly different since the original machine used mask roms rather than writable roms. So, it's very much not about "sense" on a practical level (then VICE with a couple of Quickshot competition pro USB sticks makes the most sense)