1. You’ll have to modify more files.
See tutorial forum for missions against nomads.
2. Making missions against battleships and gunboats is not a problem.
So far seems that adjusting payment is the problem(as I wrote in the thread you’ve mentioned above, battleships in 300k missions and no battleships in 500k missions).
Maybe Forsaken can shed some light on this. He is making missions against battleships for his mod, he is also facing this problem I guess.
I am planning make a desperate attempt to adjust payment this weekend.
The topic I started is not dead yet(i hope).