Don't the 909's have the larger form factor? The rapiers can be done away with completely, but my very first launch with this configuration was flawless. I had Kerbals landing on the Mun, landing on Kerbin, orbiting both, etc. I effectively ended up with a large fleet of RAPIER ships in orbit. Here's a video. http://youtu.be/TPgyJCW3D0Q By the way, here is the video for the experimental Pandora VII. Just seeing how big they can be made.