When doing a project like you are into I prefer to do one of 2 ways:

1) Remove engine and do the job on an engine stand

2) Lift the cab and have complete access to engine using the frame as an engine stand.


It's just no fun when you have to lean over and have suck limited access to bolts and viewing.

To answer your question about splitting the turbo yes I have done this, but it is not easy. The turbo drain bolts are probably the hardest part. I did mine several times to do parts swaps several years back. I took a 12mm wrench and bent about 90° and added an extension handle to get the drain bolts.