I really like how the ventilation system looks. Those big creepy spider legs should be racing mining equipment around mars, not sucking flux-fumes.
Ok, onto frustration:
I did my second set of waterbottle bosses yesterday and MAN were they more of a pain that the first set. First, one of the reinforcement plates shifted when I was trying to braze it in place. Then, after quickly doing the other one, I came back to it, and used too much silver, totally obscuring it's line at one point. When painted, it'd look like a vaguely star shaped blob. I heated it up to redistribute it and ended up with too much silver in a bunch of places.
When I heated it again to try to flow the silver around and get rid of that one lump, I ended up with too much silver all of the way around. Then I spent an hour or so filing to try to get rid of it the old fashioned way.
When it looked pretty ok, and I thought I was done, I noticed that there was a gap in the silver on the first finished plate. Small, but worth fixing. So, I heated things up, and couldn't resist one more shot at the over-silvered point. It was a bit better this time, but still needed a lot more sanding and filing... as did the first plate after I "fixed" the gap.
So, there you have it, about four hours of sanding, reheating, filing, and sand blasting for two water bottle bolts. Last ones took about 20 minutes. I was careful, and I don't think I thinned out the tube too much, but I'm not super happy with the process. Next time, way, way lighter on the silver.