Re: Thinking about building my own tube amp....
Trinity Amps has a great reputation and makes 18 Watt and Matchless Lightning kits. They also make a Tweed Deluxe kit, but if that's what you want you can't beat Mission Amps (is there an echo in here?)
I'm just finishing up a Tweed Princeton/Harvard project. Started with a "kit" from STF Electronics. If you want to build a straight Champ, STF would be fine. I wandered off the standard path and into a bit of a mess. Learned a lot though.
Weber makes great speakers and chassis IMHO. However, some of the components in their "kits" are not always top quality from everything I've read and the support seems to vary. The forum is really hard to use.
Mojo makes great cabs but their kits REALLY are projects, i.e. collections of parts that you have to figure out how to turn into an amp. They do have authorized dealers like STF who provide support.
There are three great forums out there that I know of (and certainly others I haven't found yet):
Hoffman Fender oriented, traditional but very helpful
AX84 really neat projects for "simple" amps
18 Watt not as friendly for newbies like me, but lots of good info. You can learn a lot from the discussions and schematics of all the 18 Watt variations.
Oh, Trinity has a forum that's not so active, but great guys and good support from Stephen Coors of Trinity even if you didn't buy anything from him.
Even more than a parts guitar, you are NOT going to save money on an amp kit. You'll learn tons and have fun though!
Chip