Yes..several of us have. It's doable but requires being very meticulous and clean. A detailed manual is critical and if you can find something that supplements the crappy pictures in the ATSG manual it's a big help.

A transmission holding fixture is also HIGHLY recommended otherwise taking tolerance measurements (on the order of 10ths of a mm) is going to be suspect.

I would rate the tranny a 9/10 on the DIY scale..just under rebuilding the bottom end of an MB diesel motor. That's subjective though as I've never attempted the latter.

Valve body rebuild gets an 11 on a scale of 10.

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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)