I was thinking that if there was a game exactly like sins, but WW2 themed naval combat that it would be incredibly fun.
I mean the 3 reasources are simple enough and in a WW2 themed mod you could simply change the reasources to $$$, Metal (no change), and oil.
The graphics would have to massively be reworked as well as the upgrades for the diffrent areas(I use areas because the WW2 mod i speak of would so massively rework the game to the point of there not being planets but instead islands)
Another requirement of this would be to remove the phase lanes and add a fog of war.
...seeing that what I've requested is nigh impossible but pretty intresting I'll leave you to ponder it.