Stats are sort of finished, at least for the planes involved in this. Tell me what you think.

On supermaneuverability: I've come to the tentative decision that that perk will mean that I roll 2 dice for your evasion checks, and use the lowest result. So for example, someone in a supermaneuverable plane needs to pass a check while operating at an EV of 40, and they roll a 51 and a 32. They still pass the test. So don't be confused if you see that a non-supermaneuverable plane has a comparable or higher EV to one that is, because the supermaneuverable plane will still be better at evading.
On RGMS: The farther away you are from the missile, the more difficult it is to evade. At close range, there is a bonus to evade, because you shouldn't even be firing them that close; at most other missile ranges, it becomes easy, but not guaranteed to avoid; and if it's firing from farther than you can shoot back, it uses the last stat. Chaff is recommended in that case.
On the MMS: Number of missiles evaded is determined by degrees of success. I won't get too far into how this works because I don't want to bore you, but let's just say you just
barely fail a test to avoid an MMS-6. Like, say you needed a 40 and got 43. In that case you would have evaded all but one of the missiles.