Thanks for all of the great comments, everyone!
I plan on doing an endurance test at some point - I have a feeling the driver will give out before the diode does from overheating. I'm using an X-Boost (just got the module from DTR). I'm sure it'll last five minutes, but the driver is not heatsinked, unfortunately. However, I assume that since it's only outputting 300mA it shouldn't need much of it.
The silver really is beautiful. It has an incredible weight to it. It's significantly heavier than solid copper. The price wasn't actually that bad. For a host this size (enough for a single 14500 battery), it was about $250 shipped. It's a lot, but compared to some of the lasers people buy on this forum, it's really not all that much.
Regarding the innards... it's actually really simple. It's just a 12mm hole down the bore, slightly longer than a complete AixiZ module. The host came with a little battery contact to solder a lead to so that one can get the positive connection. Then there is the battery tube and the tailcap! Pretty simple.