My go to warp capable SV wouldn't even get off the ground in alpha 12, so I spent some time on it. I used replaceblocks to change all the hardened steel blocks to regular steel. I changed the small thrusters to medium. Now, it lifts off and reaches top speed quickly, however turning is just a joke. I put 30 RCS units on it and it turned exactly the same as with 3. WTF is up with that? It's rotating about 30 degrees per second, which would make dodging ground fire impossible. What's funny is I thought "let me try out my starter CV build" thinking it wouldn't get out of it's own way. I replaced the lift thrusters with mediums. Not only did it lift off fine- it is nimble and turns at like 100 degrees/second. Oh, and it's made entirely out of combat blocks. This doesn't make sense. Does the SV need to "recalculate" or something?
Easiest way is to put it on the steam workshop as public, then share the link here. From the in game blueprint library select it and press the button to upload it. Select public.