After a bit of looking around I found these toys on eBay. Just lately I found a larger version that will become a heavy VTOL. These flyers could be classed as attack craft with their huge forward plasma cannons, although I think I will use them as medium class VTOLs. Medium class can carry a single squad of Aliens (6) with the heavy class carrying two (12).
I imagine the hi tech Soriog wanting to get in close to their foes and quickly too. These grav VTOLs should be the answer. The rules (GRUNTZ) say If a VTOL is shot down in flight all on board are lost, that could a way of taking out a whole squad of very deadly and expensive Aliens.
IRON MITTEN TIP #34. Two paints that every Sci-fi painter should have in his paint rack. Tamiya Metallic blue and Miniature paints' Blue steel. If you are painting anything Alien these two paints will come into their own.