I've seen dudes put S10 beds on the backs of Deco and AD trucks.. some looked alright, others looked like crap.
You'll pay thru the nose for a new repro bed, fenders, and bedwood kit.. you'd probably get off alot cheaper buying a whole other truck and snatching the bed off it.
The fenders alone can set you back upwards of $300 for a used, original set.. and fiberglass repops sell for something like $200+ a piece.