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I used to own a Fibreglass business, and built 42' boats and fuel tanks for Carribean, and as simple as you all make it sound, it isn't.
Mold making is critical as the heat and curing forces of the part will distort the mold, putting every piece out of alignment.
A Mold must be laid up thick, reinforced with Wood (preferably steel), and it HAS TO HAVE tooling gel for its gel coat or you will damage it, and really wasting your time and money if you don't.
And speaking of money, bulk fibreglass resin is very expensive and so is the matt (and you need more than 1 type of matt).
Tooling gel is very expensive!
Then there is the 20+ litres of Acetone (which you will definitely need).
You can lay Fibreglass without the proper metal hand rollers, but I'd hate to try.
Do you know how to make the Talcum Bog you will need.
These are the reasons I've never done this myself.
It just isn't cost effective.
And all this is just for the Mold!
If you want to make a fibreglass Dome, go for it.
I'm just letting you know some points so you can't say "no-one said so".
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