I was in a similar situation about a year ago with my engine swap and why I could not attend last years event. I was lucky enough that I was able to do all the wrenching on my own car at my buddies shop and he let me work on it everyday after work.

Yeah I would say unless you have a team of friends helping out night and day thrashing, 3 weeks is not going to be enough time to get it all done and road worthy. These things take time to get sorted out. It can be done though, not saying it is impossible...

No worries Samy if you can't bring the Dart, you can ride along in my car