Good luck. I had plans to do this a while ago but stopped because many parts were not up to my standards (and parts of it are outdated). I'm focusing on the SWL-120, but if you really do want to finish it you'll want one year of free time, and I'd start by assembling all the separate parts into one file and making any improvements necessary. The fuselage can also be redone, maybe keeping some aspects like the landing gear.

To be perfectly honest, I'd recommend the 717 instead which is newer and has some cool stuff klm never posted publicly.