Surefoot

Had the issue where the USModule would block the fuel flow from a tank on its opposite side. Removing then reinstalling the part "solved" it but I was not really confident it would last.. Solution for me was to swap their positions.

Looks like you'll have to either add VTOL capability to your SSTO or find a suitable flat surface (small rocks have no colliders). Another option i've considered is to use that mod which allows building runways on other planets.

Wait til you see a few other places like Eve (the planet) or Laythe

I just landed on Eve on my freshly restarted career. Mind blown, jaw dropped. Well played sir ! This is amazing. I wont spoil the thing (went there without looking at the trailer or anything) so the surprise is intact - it's all worth the trouble.

The tail part seems too small on that SU-34, especially the vertical rudders (but i'd say the rear part is too small in general compared to the front ?). Or is it the camera ? Compared to your SU-27 for example..

Very nice details on that SU-27 !

First make sure your control surfaces, and wing shape/surface are similar to the real thing: Also make sure you try and keep the proportions right (and thus the CoL vs CoM) because that's a key element. Also note how the wing root extensions are done and merging with the fuselage, and how they cover the intakes (which are not too far behind the cockpit actually). I know first hand it's a lot of hours of work doing all that fine detail, but Sukhoi are into fine details that are kinda important to aerodynamics... Once you have a really close model, you'll find out it's completely unstable and will flip over immediately. You need the AtmosphereAutopilot mod that simulates the fly by wire system of modern jets. Just set the limits in AA to decent realistic values, and you'll have an SU 27 that flies almost like the real thing (edit) from what i see in DCS (and i suppose it's like the real one) the edge slats are working in counter-AoA mode.

Impressive models here, i can see a lot of attention to details, what mod did you use to get the fuselage so perfect ?

You still need to work that model a bit here's a mig 35 isometric projection view: It should be wider and shorter in length. Also notice how the air intakes are completely hidden below the wing root extensions (and not sticking out).

That F-14 is looking good ! Did you manage to recreate the variable wings or are they just swept all the way permanently ?

It does mostly, and if you stick to (proven) realistic designs they usually work very well. That's the main reason why i love FAR so much and spent hundreds of hours tinkering with aerodynamic designs. It's like "build-your-own-X-Plane" simulator Fighter jets usually fly pretty much like in the best flight sims out there, which is amazing.

I use both B9PW and Procedural Parts, they work fine in 1.3.1.

Procedural wings is a must have, keeps part count a lot more reasonable.

They seem to work, at least the flight model of my KU-57 seems realistic enough, although i have limited elements of comparison (SU-33 simulation in DCS or other flight sims). I know the SU-33 (it's basically an SU-27 with canards) is not the same design as SU-57 but it takes from the same bag of tricks and is also naturally unstable. On my flight tests with FAR i notice the leading edge AoA slats will definitely improve handling at high AoA and delay stall. With thrust vectoring i can even throw the plane around at such high G's i'll just disintegrate the airframe from the stress. Putting a G limiter on AA makes it fly mostly like an agile SU-27. The real world SU-27 has also very wide flight characteristics and is able to pull damaging G's if you override the joystick limiter, to pull aerobatic figures like the "cobra". Yeah that turns out to be similar to how they work on real models, you can watch them in DCS for example on SU-27 you'll see the leading edge slats countering AoA. Same goes for the F-15 "side pods" extensions, they do move counter to AoA (although in a very limited manner). And yeah on that F-22 photo you can see them clearly too. (edit) on that very nice SU-57 photo they are also quite obvious:

Yes, if possible you should have elevators near the center, and flaperons as far as possible on each side (see how the B-2 achieves it). It's not the guarantee of a perfectly stable aircraft though, if your CoL shifts too much when opening the bay (and that pressure curve doesnt look good...) that might be another cause for instability. I'd try to add more yaw authority first, in any case.