Welcome to the site!
You've done the best first step, and that is to buy a complete donor vehicle. You'll have all the parts you need to swap over to the gasser. I've done two gas to diesel swaps, and it's always the little pieces and parts that nickel and dime you to death. Having a whole donor rig makes it a lot easier.
I'm not sure about that turbo setup, but I'm guessing it's an early ATS setup. They're the only ones I know of that utilizes the stock air cleaner air housing like that. Yours looks a bit different though. Perhaps John8662 will chime in here soon. He's really familiar with the ATS systems.
Casey
1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter