BattleCruiserCommander I knew that problems arise, various solutions are possible:
for all ships with a single cannon, I know that I should have left the star wars mod in the list, you can put a blaster or me long cannon blaster which looks like a spade;
For the Danton, you can shift the arms a little;
Agamemnon, for the superimposed weapons, use the doudle turret with the gatling, for the simpe barrels, with barrel and;
For the Courbet, try to make it bigger to avoid the problem of pillbox if you please.