the 4R100 isn't a complicated trans to build. I sat down with a local builder with specific parts for my 7.3 2.5 truck trans build. think I had $4,000 in parts/labor.
Brians Truck Stop has been building some of the toughest 4R's out there for awhile. Not sure what your budget/time frame is but their worth looking into. he's in Northern Arkansas E4OD | 4R100 | 5R110 Ford Diesel Powerstroke Transmissions