Retrofitting a modern drivetrain on an old bike, caveats?
I have this bike in a size that doesn't fit me: http://bianchiusa.com/05_bergamo.html
That's a 7-speed cassette, a 3-speed hub, and a single chainring in the front.
And a 1983 Ross Grand Touring 12-speed. It's your standard 80s road bike with drop bars, downtube shifters, and mostly Altus components.
I would like to take drivetrain components (Wheels w/ internally geared hub, Crankset, Chain, Derailleur, shifters, and cabling), off the Bianchi and retrofit them onto the Ross.
I am not an experienced mechanic and would like to know what problems I'll run into ahead of time. I have read a little about derailleur adjustment and limit screws but have never actually done it.
I know that I will need to have the shop do the crankset work for me, as I don't have the tools. And I am going to have to get a HubBub adapter to run that grip shifter on the drop bars (Unless there is another way??).
Is there anything else that I need to look out for?
Also, bonus question: Would it be possible to leave the double chainrings on the Ross and run this as a 42-speed bike? Mostly just a silly academic question.