While you have the F35 apart, will you have them replace any wear parts? The reason I am asking is I also looked at having a F35 rebuilt - and experienced a heart attack at the price, which was shocking even without adding the LSD into the cost.
I looked at the F40, saw the videos on it and how simple the disassembly, LSD installation, and reassembly were. This is the reason I purchased a new F40 transmission and bought the Quaife to install. It's as easy as the VW transmission - done that before on a VR6 GTI.