Glad I found this thread, started doing the same myself and have about 3300 parts already. I'm not going for exact matches, the prices for the rigging and dish are just too absurd for that, and a lot of the technic internal structure is hidden so can be any colour. Wouldn't mind an instruction book though, I bet trying to use the PDF file will wear thin after a while.
I am starting to run into the problem of individual bricklink stores having fewer lots in stock. Rather than waste money on 'filler' purchases to meet minimum spend limits and delivery charges from multiple stores I think I will get as far as I can and then do one final order through Lego replacement part service for the rest.
The reason I got sold onto this method was that rather than give my wife a heart attack for spending $1500 on a single lego set I can spread the cost over months of smaller purchases. I figure it'll still be up around $700 to complete, but it doesn't seem too bad when I am only spending $80 to $100 a month on it!
Just have to figure out where to display it now, the wall mounted TV bracket idea is very tempting but it mean I'll probably have to build it twice, first time to plan, second time with bracket mods....oh well, not such a great hardship!