Interesting fly Joe. Keep 'em coming!
If you want to use something other than 5 min epoxy, couldn't you just let it set a little before you build up the body? Or would that not work for some reason? Just a thought.
I can't stand the smell of the 5 min stuff. I use the Devcon 2 ton because it has virtually no odor. I usually need the extra working time anyway:hehe: I've never tried to fill in a large space like that though.