Alright, I've made it most of the way through this. So far, it's been fun, although wicked hard in places. The stealth missions actually weren't too difficult for me: I think I beat the first one on my second try, the rest on the first. Better yet, they were easily the most exciting and fun stealth missions I've played to date. Well done!
Mission 17a is kicking my butt though. I'll have to try it again now that I know that the akheton can shoot 2000m (yes, I've done the entire campaign so far without knowing that!) and see if I can take down enough turrets with it to get that Amun mk2 into the trench. I've also tried it with the other heavy bomber, and gotten closer... I was able to spend 5 minutes picking off turrets with trebs, then get into the trench a few times. Problem was, either wandering fighters would get to me or the support ship would fail to do so in time.