I had the idea of trying to recreate WC3 as a campaign for your mod, I haven't read so much into how to do it with HWRM , but I have spent some time in the WC3 walkthrough making notes about the types and layouts of the missions, and ships involved.... yep, I'll probably have to do that.
At least how I look at it, it certainly seams that it could be made within HWRM. The best way that I could see how to do it would be each WC3 system campaign would be a single mission within HWRM. This would mean that there would be 11 HWRM missions.
I haven't got too much left to do to my notes to finish them off, but I started to get a little put off as I started to look into the HWRM side, then life and time got in the way
However from what you say @L.I.F. and it can be made quite simply perhaps it is something that I can try to get going again. If nothing else I can certainly share my notes.
And a bit of useless information - in WC3 there are a total of 702 enemy ships (not including the unlimited waves that are faced at Kilrah or on the loosing missions)