Well, I messed around with the latest version. First off, by the Emperor's left ball, the visuals are incredible! I love the new buildings and the ships have even better details! The only concerns I have are about things you have intentionally, so I don't expect vast, if any, changes:
Ships die VERY fast. Now, I don't mean an über battle of a hundred plus ships. I mean, ten minutes into the game I have a cap ship and some frigates taking the nearby planets held by rebels and the like and the dinky frigates on both sides die within seconds. This isn't necessarily a bad thing, but if the armour and hit points and damage are to remain as they are, I feel weapon ranges might be reduced a bit. I could barely enjoy seeing my meagre yet impressive (visually) excuse for a fleet enter a system and open fire. Within seconds, all rebels are destroyed. And that's nearly halfway across the awesomely huge gravity wells. The huge range, in my opinion, defeats the new big gravity wells. But I love the large size. Now the porous core has a noticeable affect on gravity wells!
Either here or on your forums, I wouldn't be surprised if someone has brought this up already, but I will ask anyway: what about prices? With the short life spans of ships, should the costs be so high in both resources and population? It is... difficult to get a bunch of ships until you've taken a dozen planets or more. And even when you do, they die bloody fast, so it's hard to replenish them quickly. Again, might be intentional, but I wanted to ask nevertheless.
Also, I was looking at the diplomacy tab and seeing all TEC names got me thinking; maybe someone already thought of this, in which case this is pointless, but better safe than sorry: for names of computer, you could have the different Segmentum fleets, such as Segmentum Pacificus or Scarrus. Chaos would have legion names or corrupt fleet names perhaps, same for Marines (albiet with chapters), and so on down the list of different factions/races that you decide to include. As for markings, which could be a problem since my beloved Space Wolves do NOT use the same markings as those panzy "ultra"marines, just use the basic symbol for each race/faction: star of Chaos, Aquila for Imperials/Marines, some Eldar rune, the basic Tau symbol, and so on for whichever races make it into the mod. If you want to have such decorations on the ships, of course.
The imperial shipyards are wicked cool. I had to mention it. Perhaps there will be a research upgrade to allow the frigate factories the ability to make three ships at once, since they appear to have three docking berths or whatever? That would be cool
Well, there are my two Imperial Crowns. Take or ignore at your leisure