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Before launching into the rebuild, you might want to do a couple of checks.
1.Do a Leakdown check and a borescope inspection. This will give you an idea in advance about the state of your cylinders and rings. Turbos can be hard on rings. If one or more is broken it will score the cylinder, which will likely be a write-off for the cylinder and the piston.
2. Take off the rocker covers and look for broken studs. Your increased oil leakage could be due to that problem. This usually shows up as a mess at the base of the cylinders where they contact the crankcase. You will want to go with the current replacement 993TT studs, and if you find some broken ones you might want to curtail further turbo adventures until it can be addressed.
3. It can be very convenient to switch to electronic fuel injection at some point, so the DME style flywheel and a lighter weight clutch would be a good idea. You will love the the feel and drivability of a lighter clutch package, and the DME flywheel makes it easy to adapt a crank sensor later.
I think your list is a good one. I would add though to remove the air injectors and plug the air injection ports in the cylinder heads.
Also, it is common for the backside diaphram to be shot in the distributor. The formerly rubber diaphram coating turns to a red dust.
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