On mine the fit of the cabin to the hull was AWFUL. So bad in fact that I gave up on it and it's gathering dust! It may have been due to the construction sequence I used, so your results might be different
I've just spent 2 months doing a complete overhaul of one of our antennas at work, an 11m DBS-Band dish, in readiness for service on that satellite. Also, it is NOT Facebook's satellite! It was the AMOS-6, owned by Spacecom, Facebook had just leased some transponder capacity on it. It no more makes the satellite theirs than ours seeing as we had space reserved on it!
I'll add that the one thing my airbrush is a godsend for is getting good, solid coats of white paint in one or two goes. Can't do that with a hairy stick!
I'd go for an Antex soldering iron. I've had one for years and I wouldn't use anything else. They have a selection of tips to choose from as well. Around £25 from Maplin.
I was there the day the rangerfinder turret was installed at the Noirmont command bunker. Really must renew my Channel Islands Occupation Society membership!
I stick my head into the Coventry branch if I'm there, but with Antics in the centre, Joto's in Rugby (home) and Punctillo's in Hinckley, then there's not often anything they have of interest. Added bonus of Joto's is that I can have a chat whilst I'm in there