I do pretty well all my foam building with hotglue, other than the sheeting.
The biggest problem is, the large gluesticks cannot be heated fast enough because of the large volume of glue. Ran into this at first, many yrs ago.
I've been using the smaller 1/4 in stick guns since then. With the smaller volume if the smaller guns, the heating element can keep up with it, as long as you throw sticks in the back end.
Best gun I found is the Martha Stewart guns for sale at Wallmart. It's the only one that I found that doesn't drip while it's sitting, at least very little. I always take one to the field where the other guys as well as me, use it to keep our planes flying.