Glad you like them, it is a fun challenge trying to adapt the Thunderbirds to working designs in Kerbal. I have probably given Thunderbird 3 the the most development time due to it being one of my favourites and how awesome it would be to having a working SSTO that is supposed to have luna range. Here are the older versions, TB-03 Mk I: http://cloud-2.steampowered.com/ugc/577864380331717593/7C4F324DE4409AFEA4F87CB4AA570CF973E88863/ I went straight for looks on this one since the orange tanks are the closest to TB3s red, was a bit too heavy and ran out of fuel with only 1/3 of an orbit. TB-03 Mk II: http://cloud-2.steampowered.com/ugc/613893641187747042/953B18029E8AD7EACEE23834BD78A182F01A4000/ I went I bit overboard on the looks on this one, the wing pieces I used to mimic the reactor cooling fins proved to be too much dead weight...and when I removed them if felt apart on the pad Since I know the basic shape can get to orbit, I now need to work more on functionality.