My computer was lagging when testing the shuttle so i figured i'd play it safe, and i was getting lazy after doing the shuttle lol. for the cargo bay doors i used a ½ width solar panel with a texture. The shuttle itself also had really high delta V, it was nearly an SSTO except for the whole circularizing the orbit thing, now that it has an orbiter it'll probably make it to the moon lol. I also had a bit of fuel left over when the shuttle was landing so i nearly crashed, had to do a lander style landing where i burn fuel at the end in conjunction with parachutes.