It's not the 3000, but I have been running a Rapman with "Reprap like" electronics for a few years
https://www.youtube.com/watch?v=FvIpMBKUcCIIn that video, I am using an Arduino Due with RAMPS-FD, but I am quite sure Mega+RAMPS would do the job.
It was mostly a straightforward conversion, just a little tweak to get the homing to work correctly and establish workable print speeds (quite low it turns out).
I have replaced the hotend with a cheap compatible one from ebay (which is now also failing !). I looked into mounting a Gregs type extruder, but it is a difficult fit, most Reprap hotends are too short. I have some designs for a printed carriage, I haven't got to the point of trying one yet.