I mean, I would totally be willing to get involved with this. Plus, to make the sounds the same levels, etc., would be no different than mastering a commercial for tv, for example. I do it all the time.
There are some great programs for cleaning the hiss, etc., like iZotope rx8, or their audiolab cleaner, which could fix a lot of that.
I also have a booth and Rode nt1a mic, and the samples are good enough for microsoft, pepsi, audi, etc., so could record whatever.... unfortunately, I'm based in Eastern Europe so it would be hard to get people here to help... but I can ask some local people if they would.
You guys interested in doing a sound overhaul mod together?
Cool about the doors mod... I'll check it out.
Oh, and btw, about the finishing touches stuff... I absolutely and totally am of the opposite thought. People tend to forget we are using an audio/visual medium. No one even says anything about decent sound, only about fabulous sound or crappy sound. It fades in our list of importance as compared to visual, yet we rely on it for the realism quite a bit. There is absolutely no reason that it would need to be pushed to an afterthought mode or down the list... it is easily worked on simultaneously, and as with the alpha progressions, get better over time.
Just my 2 cents