I still need to paint the lid and maybe make a vent system for the top.
I may work on the improvements later. I'm not real happy with the thermometer I bought, it seems to read about 50 degrees too hot. I've been shopping around and reading reviews, so I'll see where that takes me.
I may put some pipe elbows on the two side vents and place valves closer to the top. I've seen other design with this configuration, but I'm not sure it's worth the effort. It's not like it's hard to bend down and adjust the valve at ground level. I'm still considering custom paint options as well. Hopefully the 3 coats I have on it now will keep it protected from rust, but I may spice it up a little bit.