Well it took four tries, but I finally managed to put together a halfway decent heliostat. It's still not 100 percent finished, but I took it out for a test run and it did pretty well. I need to add more mirrors and finish off some weatherproofing but here are some pictures of what I have so far.
Here's a picture with the top removed.
Here's a picture of the bottom part opened up.
I hope to make another one in the future after I find all of the bugs in this design. Building these things has required a serious learning curve as I didn't have much experience with welding and machining when I first started. You can obviously tell by comparing some of the earlier pictures in this thread with the ones here that I've made some big improvements in the way I make things. I still need a lot more practice at making precision parts, but I'm getting there.
Hopefully I will get faster at making these things too. I think if I make jigs to help align everything then I should be able to make them pretty quickly. For this one, there was a lot of extra time taken where I had to do things like grind parts down to make them fit. This was due in large part to the fact that I didn't have everything completely thought out before I started.
I plan on showing it off some more once I get everything finished. We'll see how it holds up long term, but hopefully it should work well enough for me to get some good use out of it.