find an axle the fits the track of the vehicle first, then look for springs of a length that will be usable. I just started to build one myself and had a hard time finding short springs and custom springs can be pricey. I found some at specialty cars in artesia for less than just springs at the spring shop, included were the hangers bushings and misc. Im using a F100 axle, parts are very availble for these axles, including disc brake kits ect. Stick to cross steering also, its been done sucessfully many times, and who cares if it handles.....it will look bitchen, good luck, i know im gonna need luck to get it done....
Randy