Call Brent at Trailtough, he has a kit almost done if not done for doing just that. It has everything you need to accomplish the Toykick SAS coil swap. He told me that there is minimal welding that needs to be done. The spring pads for the leaf springs that are on the stock Toy axles are the centering point for the control arm mounts on the axle. You bolt the mounts to the housing, then you weld them on. The rest is a bolt on to the truck. The kit comes with steering, shocks & mounts, brake hoses, I think it might even come with drivelines, not sure about that one, all the control arms & mounts, coils & buckets, might be more, can't remember right now it's been a while since that conversation came up. You'd have to call him on the price, keep in mind that it is a bolt on kit that is very complete.
Hope this helps.