That's a beautiful craft, and I'm enjoying your process. Thanks for sharing. You said earlier that you were having stability problems; I suggest that might be the canards. I have a really hard time designing small craft with them. Right now, you have more control authority in the front than the back. Definitely add more wings--It'll lower your AoA so that you can get more speed out of the turbojets. My rule of thumb is 1 lift unit per ton of mass. To that end, my spaceplanes are "lifting bodies" with Structural Wing panels on the underbody. Another fun thing to do (but ugly) is to put rover wheels on the nose of the craft. Place them higher than your extended landing gear, and you can truck around on planets by raising the nose gear.