Could save yourself the money and the hassle and buy a TFS55 isuzu or the chevy version like mine....
Cheap as chips, chain driven 2.8td, G80 in most, tougher front diff, and a truckman top will fit straight on, normally come with a bedliner, drop down tailgate sooner than the 2.8 swingaway...
Dont get me wrong...love doing a plasma chop project myself...but spending more dosh to reinvent the wheel as such doesnt make sense to me sometimes...
Just another thought for you anyway.
