Re: First build/questions
If you want to use spray foam for the larger cavities you certainly can. I would be careful though to only do a small amount to avoid it expanding too much and popping the cork off of the glass.
If you went that route you should be able to do multiple sides in the same sitting. Especially since they're already attached to the glass.
Blue Jeans,Leucomelas,Terribilis,Azureus, Paru