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I went with no forms and found it quite easy as log as you have time to wait for each brick to set harh enough to set the next. If you have a length of wood measured to the right lenght and use this for the whole build, your oven will be just fine and you can clean as you go. have fun building and take your time.
I used Refmix, and even on the last course I only needed to wait about 60 seconds on each brick before moving my guide/support. Once the refmix hits brick (even soaked brick), the water seems to just drain away.
I used the 3:1:1:1 homebrew mortar for my transition to the chimney. It seemed to be more slippery and plasticy than the Refmix. (Consequently, it spread easier to my surprise.) I have a feeling the homebrew on the dome would have required more "support time" on each brick.
My 2nd post in my build thread shows the best picture I have of the rotating vane. It worked, but was a bit troublesome. The spinning disk would freeze up due to changes in humidity and due to soaking up some water from clean-up operations. If I had to do it again, I would put a pin in the bottom of the vane that would fit into a hole in the center of the disk. A drill bit would work as the pin; just drill in and leave the bit. That way only the vane would rotate and not the entire disk.
Thre are lots of ways to hold the bricks and the time each one takes depends a lot on the mortar and the weather. I don't like wasting time or money so I just used scrap timber held with clamps as adjustable supports. It doesn't much matter what you use on the way, only that you enjoy your build and get the dome as round as you can. I am really happy with the way my dome has turned up and I am nearly finished my entry now so it is getting close to having a fire.