I'm always amused by the argument that the Mustang II is 'safer'. If you can't line things up straight and weld them so they stay together what difference does it make whether its a clip or a commercial kit?
If you can get a kit designed for your vehicle, and if we're talking Stovebolts you certainly can, some of the engineering is already done, but you still have all the workmanship issues and if you can't follow directions you're even worse off.
If you are paying someone to build the suspension for you, the cost may be a wash or even favor the kit, but if you're doing it yourself (provided you can) I think the opportunity to save money is still there for the careful shopper.
I have a GM G-body frame sitting in my yard, and I'm inclined to use it just because I'm tired of hearing people say its a bad idea.
