I know this has been on hiatus for awhile, but a few points of info:

Suspiria- I assume this is on hold, pending the Synapse and TLE restorations coming in the next year. Gives sources to work with much better than what is already available.

Inferno- Is the German BD definitely going to be the basis for the custom BD? The Arrow is grain-reduced and the Blue Underground has contrast boosting/revisionist color timing.

However, there is the French Wild Side release which has not received much coverage. It seems a bit bright, but grain structure is good. There are forced subs, which could easily removed. I have a copy and could post screen caps to compare with another edition. Any interest?

The Mother of Tears- There's a new German BD. Same issues, which may stem from the bad final DI.