First, be aware that I am unfamiliar with Vassal. But...
How are your fish kitted out? I like warfish, but at least give them a disruption pod.
You may want to allocate shield drones to the broadsides, as a lot of firepower is going to come their way. And I would trade the multi-tracker for a target lock. Saturating multiple targets with railgun fire is a beautiful thing.
The only thing i don't like are the marker light fire warriors. This is just personal preference, but I find them too static in an army that needs to be mobile. (Stealth suits would better fit the theme of this army even though I wouldn't recommend them.)
The Broadsides are an exception because I like to set traps with them. Just be aware that in dawn of war missions, your Broadsides will lose a valuable turn of shooting with out the A.S.S.
Ultimately, though, I say play it. You'll find out quickly where your problems lie.