Sort of a related story to go with yours...
A friend of mine asked me if I could resurrect a 750 Honda Interceptor for him...it was his dads and it was parked for 10 yrs with 1000kms on it, hid dad developed Parkinson's and couldn't ride and my friend was posted in Germany so couldn't do anything with it.
The worst part of it all is it was just parked, no fuel was drained so you know what the carbs and tank looked like...the saving grace is it was parked in a heated garage so wasn't all rotted out.
I happened to be on redeployment leave and had lots of time on my hands so I delved into it and it was a real bear to work on but I finally got it all sorted and back to him. I put all new lines, fuel pump, rebuilt the carbs(they sucked to get off and sort out all the linkages), fluids, chain, tires, rebuilt the calipers, polished it and made it run....that was in 93 and he still has it today tucked away...
It can be done, and you will do it....it wont be inexpensive but that's not something to worry about due to the significance of this bike to you.