Congratulations. I love my Gatewood. It’s my shoulder season shelter when it’s it’s not cold enough for my Kifaru Supertarp and not warm enough for my hammock.
I recently weathered a good storm in mine, and found no need for a bivy. Check out this article for good setup info. I like the higher pitch advocated by the author in almost all situations unless I know a storm is blowing in.
I’ve given up on a groundsheet with mine, instead using a very light, rather wide cc pad (similar to Gossamers Thin lite pad) under my Pacific Outdoors air mat.
As far as bugs go, I’m considering Ron’s Serenity bug tent to go with it. On the other hand, down here when the bugs are bad it’s usually time to hit the hammock anyway, so we’ll see.
Hope this helps.