Nice! Just built a similar vehicle (pretty much the same just with the 3.75m capsule on the front and a different wing/tail layout) which was able to do a Mun flyby on its own and when airlaunched from a Goliath-powered plane, could land on Minmus and return with plenty of fuel left over. I wonder if it's possible to strap on a few Whiplash engines and take it to Duna or Laythe and back?