There are no rear-ward firing missiles in my Weapons package... the holes that go on the back of the pod are for exhaust, like a Bazooka, instead of like on a battle-tech 'mech, where they didn't think about the gasses/fire created by firing a missile...
The 4 hard-point sugestion was something I noticed, but I don't feel the need to correct it.
They did provide light-cover clear pieces to cover what I expected were venier thrusters as well. (I just leave them off and paint the hole black)
I'm not sure what you're point is on the leg FAST-packs... I'm sure that whenever you see a valkyrie (in DYRL or the ROBOTECH series) they bend their legs to accomodate them.