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Mid tech crew trainer. Got fully developed rocketry but only just into airplanes ? This panther - nerv SSTO is quite forgiving but capable of more than you think. I kept everything as low tech as possible - nose cones, wing parts, landing gear, electrical stuff are all the lowest tech possible. It's a fairly simple airplane i put together when i discovered RCS build aid. See how i arranged engines in line with CoM so no torque. Engines, cockpit are amidships near CoM, cockpit is well back from hot nose cone, fuel is in a separate stack extending in front of and behind CoM so no CoM shifts as fuel is used.
But it's still a simple airplane. Wings don't have incidence, one fuel type, one jet engine.
https://kerbalx.com/AeroGav/Voodoo-Ray