Here's a couple of my designs:
Dual Fuselage jet "Phoenix"
Mig 17 clone the handles ridiculously well. I can get upwards of 10 G's with this in-atmosphere turning.
VTOL jet I was telling you about. Hard to build cause the center of thrust has to match the center of gravity in VTOL mode, and not shift when fuel is consumed.
This is actually a stock aircraft I turned into a biplane and strapped a ton of engines onto. "Albatross." It'll take off at about 30 m/s with all that surface area, but will reach upwards of 500 m/s.
And then there's candid moments with the rocketry side of things, like this:
One of my first successful Mun returns.
All in all, I give the game a 13/10, and that's being conservative. I wish there were more planets at this point, but that's coming soon. It's still in Beta, and is easily my favorite game in my steam library.