Qenadil

The plane looks awesome and I may be using that tail design on my own planes, but as you are praising the performance you should probably take the hidden Elevon 4's out from behind the cockpit as they are inside the plane... I am all for reasonable clipping like the batteries inside the structural fuselage but control surfaces shouldn't be inside.

I was wondering why you can't access the R&D facility in the sandbox mode? I want access to the tech tree to be able to see the completed tree and know what parts are available to players at different stages. I was recently designing and testing a plane for my early career mode and it would have been helpful to see what was at different nodes in the tech tree. The only reason other than some code to not show it that I can think of is having a little mystery in career mode so that you can't just unlock a single path to the part you want.

For those who love planes there is a plane design and flight game that is in development that has just started a Kickstarter campaign that you should check out. https://www.kickstarter.com/projects/davinci-flight/davinci-flight-design-fly-and-3-d-print-your-own-p

Similar to the LV-T30 but has gimbals in one direction that is great enough to counteract the offset thrust of a shuttle type design with a fuel tank or SRB that moves the center of mass to one side. This would help with the creation of shuttle crafts in addition to being able to launch payloads with an offset center of mass. Another option that would require an update to the user interface would be an engine with a manually controlled change in angle. This would however become obsolete with robotics that would allow the user to mount an engine on a pivot.