I was seriously looking into this early last year.
Found a rolled syncro and a bare crewcab shell with no running gear.
Syncro bay crewcab FTW.

T25 syncro front and rear boxes can be fitted without too much work.
T25 has track 5" wider than a bay so you'd need to fit wheel arch spats like landrover 90/110 or narrow front and rear axles.
From the look of it the front spindles would be the most difficult bit to modify, though welding T25 and bay spindles together look like it could work.
If i had the time, money and somewhere to work i would definately build one, though a 2wd bay seems to be able to go pretty much the same places as a T25 syncro.