The RP sounds cool: the idea of the classes would make the character useful, even if you're playing in RTS like 2v2 mode. Just chose what do you want to do: fight creatures, find rare ores and get some cool stuff/cool abilities experience-related, or prefer improve your logistic systems, then play y...

What about Armored Trains with integrated turret to defend a zone ? That's completly irrelevant with the logisitic thing, but I think that would be fun ^^.

I would suggest some very useful ore, that wouldn't be minable with buildings, just by hand. This would encourage the "adventure" aspect of the game. Because building system for building system is cool, but what's the point if at the end it doesn't make you able to afford advanced stuff, f...