I unfortunately don't have the time at the moment to play this and try it out, but I have downloaded the file and pulled up the rlëd's in MissionComputer. I think they look great!
The only real way for you to be able to create the "float" aspect would be to make the ships rotate around a fixed point, ideally at the same angle at which you're viewing the ships.
Think of it like this: Currently your ships could be viewed as a triangle that moves through space but doesn't actually ever turn. It's similar to what it would look like if you put in a ship with one frame that could move through space freely but you only ever see the one side of it. The next step up, so to speak, would involve making the triangle turn as it moved, so that it would always have a front and a back. Imagine a starbridge flying around in Nova, but instead of seeing the starbridge you instead see your three squadron ships, one where the nose of the starbridge would be, the other two at either end of the starbridge's wings. The final step would be to take your rotating triangle and tilt it away from you, so that instead of looking straight down on top of it, you look at it from an angle, in this case the same angle that all of the Nova ships are currently tilted.
The best way to accomplish the latter would probably be to have a way of rendering the squadron of ships all at once and pretty much starting from scratch. The middle step would be more easily doable (and would give the squadrons a leader, even), but would still be a hassle with just normal copy/paste work, I think.
And please, don't let all of this discourage you in any way. I think what you've done so far is quite fantastic! This idea is actually something I had never heard of before and it's absolutely brilliant. Congrats to you for doing something with it. I'm looking forward to more testing whenever I get back to my computer in a couple weeks.