I am another disciple of the build it yourself route. No, there is no safety net, no, there is no guarantee, no, there is no eta on when you can crank it up, but... If you like an amp, but want it to do something slightly different, it is possible. If you'd like to build a cabinet like the ones above, totally up to you. If you like two sets of electronics, say caps for tone purposes, you can add you own switch and have both. If you want transformers from an extremely small dealer, blah blah blah. You get it. Next year I am going to build a Deluxe Reverb with the 63-64 Vibroverb Vibrato (tremolo) circuit (6G16) instead of the AB763 optoisolater circuit because I can. I can add a Reverend knockoff speaker into it, and the Mercury magnetics power and output transformers. Will it sound better than an off the shelf 65 Deluxe Reverb? Dunno, don't care, it is a fun project.
As far as the, "might kill yourself," part, I built my first amp with a lot less knowledge and survived. It is sort of like, I cooked dinner last night and didn't mortally wound myself with the chef's knife. It is dangerous, yes, but most of the danger is when you don't respect the potential that is there.
On the other hand, I know a number of people that just want it, and now, and want to go and play. The end result will be fun, but I guess it is up to you if you want to take on the project of building it.
Patrick