wow what a change! I'm also looking to upgrade mine but the information on modding these bikes seems to be quite sparse. One of the biggest concerns I have is getting the sprocket and brake disc align correct when bolting on wheels from a different bike. I do have some experience working on bikes but the thing is that I want to get it ready for the upcoming summer. I also happen to have a whole car project going on at the same time so I don't want to blow up the bike into too big of a project in itself.