Here's some different makers of kits I've heard good things about:
http://metroamp.com/store/
http://www.ceriatone.com/
http://www.brownnote.net/
All 3 of these brands seem to have good word of mouth. I'd definately research them more thoroughly. But, all 3 seem solid.
Also, there's this:
http://www.ax84.com/
I built a Torres Prince-Tone Jr. (2 X EL-84) a few years ago. Lots of fun, and great sounding! But, it was hard to build, and there were some inaccuracies in the directions, etc. I love the finished product, but am not a fan of working through/with Torres.
As to the noise issues: A lot of things can be cleared up by neater wiring and soldering. All those wires everywhere can be like little "Noise Antennaes"!
In fact, exactly how things are wired, is one of the hallmarks of Trainwreck and some other "Holy Grail" type amps. So, take a lot of time to plan out where the wires will run, and which path they will take. And look at Chassis Pictures of as many top quality handwired amps as possible. Look at the quality and technique of the wiring.
Harry Joyce (formerly of HiWatt) has some stuff so clean looking, that you'd swear it took him a year to get just a couple of wires so straight and true!
Early 80's 1957 U.S. Vintage Reissue Stratocaster (Surf Green)-Warmouth Soloist Pearly Gates Neck, Pearly Gates Bridge- Larrivee D-03 (Mahogany/ Spruce)
Carmen Ghia Head- Marshall 112 Cab W/G12H 30 or Custom 4 X 6v6 Head or Budda Twinmaster Plus Head-Traynor 212 Cab w/Eminence Texas Heats.
Mo'D-Eternity-Blues Pro- Timmy-BYOC Chorus/Vibrato- TC SCF- Korg DT 10 Pedal Tuner