Nice! i was thinking about doing the same thing. but i would replace most of the frame with black aluminium extrusions ( based on a mod for the MKII : ) so all i would need is the electronics and the y cariage. i was even thinking about buying the upgrade kit from prusa research and completing it from there that way you would have almost the same result , why would i consider this? because i dby Retrotrigger - Prusa i3 and variants