I'd LOVE to see a FE 4x4 beast, but yeah, that's some seriously daunting work.
I think your best bet would be start with a duece, or better yet- M939 series truck. They are a pleasure to work on compared to civilian equipment as Military labeled everything, parts are plentiful,they published TM's up the wazoo, and were designed to be serviced by 18 year old farmboys in the desert.
Back when GovLiq had the DRMO contract, they were cheap and plentiful- I bought 2 M931 tractors and 2 M923 cargos. Now that IronPlanet is doing the auctions, prices are through the roof and stock is scarce.
But every once in awhile, Municipalities who were given a big Army truck that was cool, but then sat as it was nowhere near as comfortable or practical as a F450, sell them back to public. Look on GovDeals'
Heck, I just found your truck. Tires are crap.
https://www.govdeals.com/index.cfm?f...233&acctid=176
few M35A2C up there, but I'd hold-out for M939 series still- 2nd gen is 8.3 Cummins to 5-speed Allison auto- will do 60 MPH easy and MUCH quieter.
Good Luck and Welcome !