Coming at this a little sideways, the Eclipse Phase sourcebooks might be what you're after - Sunward ( http://eclipsephase.com/releases/sunward-inner-system ; it's liberally licensed so there are legitimate torrents around as well ) is likely to have the most about the Venus aerostat habitats in-setting. Eclipse Phase is intended as an RPG but it's extremely hard sci-fi that at times feels it's as much a futurological thesis as a game.