As for the susp. I found some spindles that are 3" drop that are made to go on to a 3/4 ton but use the 1/2 ton rotors for around $300 so not much diference compared to reg 1/2 ton spindles.But I found some 20" 8 lug rims I like if I don't do the dually fenders.The tranny I all ready have I also have a turbo 400 I could put in or a muncie M21 easy swap.
As for the frame I have all the equip. and then some to pull that off.
Besides it is basiclly a new truck in side and out.