Mobility issue. Ok im 60something pre hip op and left knee playing up, im on a budget know i have a collection of mid 1970s bikes also a couple of modern hybrid style bikes. Now the mistake i made sold mobility scooter and purchased a raleigh e stowaway running the tranzX system , totally get Now that tranzx is locked system, but i totally adore this bike easy step thru nice little commuter bike looking at woosh and voilmart thought buy all the parts separately self build,so what's the best route and budget to take this raleigh Stow-e-way rip all the tranzx kit off and get myself a 250w twist and go ( blue badge holder) any information greatly appreciated