First things first, my build is an ugly wreck so far (and I haven't even started the dome), though I believe it will work out basic ally fine in the end. I'm about ready to pour the hearth slab, but due to too many mistakes to mention, I had a hard time levelling the bottom tray for the slab. (The top of the form is level). Does it matter if the bottom tray (and bottom of the slab) isn't level? I figure if the tray is way off level, the whole thing could collapse when the concrete gets poured, but I don't think it's nearly that bad. I used 6" wide boards for the legs, so it should be pretty darn stable. Any other concerns?
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bottom of slab won't be level