What sort of dome? There are plenty of plans for geodesic type on the web, but I think if you want a more standard type dome plans may be a bit harder to find.
For a diy dome I think your best finding something that resembles the basic shape you need else a production dome may be your best bet.
I used a 8ft satellite dish dome, but I had to construct the rolling mechanisms, slit and weatherproofing myself.
If I had my time over I’d prob just buy a prefab dome with ring.
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