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I'd put the steam shower in a new thread.

A lot of it depends on the number of fixtures being tied to it along with pipe size. You can scroll the book as it may answer some of your future questions.

This should give you an idea page 118. http://books.google.com/books?id=euDzsOnRxg0C&pg=PA118&lpg=PA118&dq=maximum+drain+vent+lengths&source=web&ots=n_91T2--Pl&sig=qbKV1HaOz925Z0QWLuT5FpWBpUA&hl=en&ei=jd-ZSdKAL6TUMMHWlPIL&sa=X&oi=book_result&resnum=10&ct=result#PPA118,M1

1/4'' slope your vent, not sure if you saw that.

Yes that is correct. I'd slope the vent at 1/4" per foot horizontally (the above portion) so rain water will not set dormant in the pipe.

You can do what it takes to vent the sink. Do not be concerned with length of run. Look up a revent, it is similar to what you are doing.

You can go as far as it takes. Yes you can do it as you describe.

Yes run the 2" combined drain from the double lavs to below the 1.5" tub drain. The new lavs do need to have a vent that is represented in your second drawing tied into another vent if you can. Is there any way to take your new double lav vent over and away from the skylights and tie in to...

How was the original sink vented? Your vent should tie into the other vent above waste flow,unless you plan on a vent going through the roof. i.e. at the location above the tub drain if possible. I would install a cleanout, being you have a double vanity, cheap insurance. I know the purple...

From what I see your double vanity is not vented. Second, your DWV appears not to code as there is no indication of purple primer in areas.

I don't think he is washing clothes in a dishwasher:D

Most likely you have cast iron. I am redoing my DWV system where the old had cast iron and steel combination. Lenox makes a decent sawzall carbide blade (around $20 for two) that works well and they also make a diamond blade ($23 ea )that works even better, it is very time comsuming. Keep your...