know exactly how they handle retro [ and your right they do leave a lot to be desired ] i raced one in the 70's [ with a stock frame ] till someone lent me a tz 750 , oddly the kawasaki handled better than the seeley suzuki it replaced .
my point was it doesn't matter how good the quality of parts you use on a project if the frame geometry is wrong it wont work . this one is wrong , built for looks over function [ as most specials seem to be ]
the pipes are actually very well done they cant be bent in an arc as two stroke header pipes are tapered , cutting and welding is the most accurate way to do it [ the other way is to blow the front pipe ]