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Brazing is a GREAT idea, I did it when I made my block. I got a copper plate, cut to the desired dimension(s), then bought a 1.5" copper end cap at home depot, and cut some copper fins from some thin plating. Cleaned everything with Hydrochloric Acid (toilet bowl cleaner "The WOrks") and then took a small propane torch to the clamped pieces...

One thing to note, If you're going to be doing multiple parts at diff times, then you need to have 2 DIFFERENT filler metals, whose "liquidius" Temps (~melting points) are where one is higher than the other. IE you soldering some copper pins or fins to the base with higher melting point filler, then last, the cap to the base with the lower, so that nothing inside it melts and falls apart. Always do the higher first, lower last, that way you can always undo the last without messing up the first brazing job... It all sounds complicated, but it's more like "Advanced" soldering in a sense... another thing about brazing, since you'll be using some sort of Silver/Tin filler, make sure you're fill gap is small, that way the conductive properties won't be lost between the 2 mediums... the more silver content, the lower you're conductivity loss, which is very minimal in the first place.

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BRAZE AWAY!!!