Like the first one I built ?Why didn't you go for the rear part of a bike frame, for the front?
Well there are a few downsides to using an existing rear end ?
If taken from a 20" fully suspension MTB the rear frame is very compressed at the BB and so limits the size of the front rings ? I cannot go above 48t as even with a 48t ring the chain saws it's way through the underside of the seat stay's
It proved to be the weakest part of the build and has broken 3 times in first 4 years.
It is very small to try and fit everything in especially if there are two brakes and 2 gear changers - speedometer - lights etc etc
regards Paul