I just started thinking about this, so it isn't fully fleshed out yet. Has anyone ever combined an underquilt with a bug net? It seems a bug net hung over the ridge line would keep an underquilt tight to the hammock. I'm thinking two shortish (48 inch?) zippers--one on each side.
The first problem I see is that there is an inherent conflict between the net and the underquilt: The net you want far away from you and the underquilt you want close to you. Shock cords at the head and foot would keep the underquilt snugged up to you, but also pull the bug net in.
Worth pursuing or dopey idea?