Hi, griehund
Good advice in the other posts here, now let me add my 2 cents worth.
I'm not trying to discourage you. Amp building can be a lot of fun, even more if your idea of fun includes watching your work go up in smoke.
Understand the danger! Putting your fingers in the wrong place inside a tube amp can kill you.
Know how to solder! If you don't have that skill, practice on scrap until you do. Bad solder joints can cause very tricky failures.
Ask questions! The only stupid questions are the ones you didn't ask.
Visit the
Weber amp building forum!
There are friendly and helpful people there, and they even have a forum section for discussing non-Weber amps.
Look around in the tweed section and check out threads about the 5E3, that will give you an idea of what people have struggled with when building this type of amp.
Sorry, no experience with tube depot kits.
As Jeff noted, using a PCB is unusual for this type of amp. That should make it a little easier for a first time build, but also a little less convenient for experimenting with modifications.
Good luck! Have fun, and let us know how it goes.
beinhard