Oh, thanks for that reminder, copypasting this from my post on the MSPA forums.
Wait, I have the strange feeling I put this before, but a game based on the
Mortal Engines series of books, building up from an inherited or somesuch small simple vessel with basic trade, hunting, scavenging etc facilities and being able to take/trade for/develop better ones of all that, adding floors, making more engines, designating the work labour types that you'd need mandated and the guilds/other systems set up to maintain it, if any at all. As well as the direct orders of what to do, obviously. The map would have seperate regions, with Europe being the main trade and battleground, China, Russia and all that being more peaceful and based around citizen conditions and such, North America being the dangerous nuclear wasteland where you can scavenge some sweet loot from that has capabilities far beyond any that can normally be researched, and South America being the place with the cool blood cultists with the arenas and shizzle. PvP area maybe?
I was thinking of an MMO, but that would only work if there was a way to prevent the cool 60 minute war tech from being flooded into the market by high-level players before new players can discover it. Possibly by limiting the absolute amount available at any one time, say, 100 of each (or whatever would be reasonably scarce, compared to the playerbase. No more than 1 in 500 players should be around for any of them though). A level cap (or levels in general) would be something I wouldn't like, everything should be limited just by structural limits, so you couldn't mount huge crushy jaws on a tiny scavenger ship because the frame wouldn't be big or strong enough. Not that you would because the material processing plants wouldn't be big enough to process a 'kill' that big in a reasonable time anyway. That way a player doesn't get lucky and find a powerful but old engine thrown away by a bigger city and discard it themselves because they're not high level enough, instead they work on repairing it and modifying the city to accommodate an engine of that size.
Also with a mode where you play as a single person, who could be a passenger on a city or a foot traveler. Could be a mercenary or a trader or something like that. It should also have transitions between the single player and city-commanding mode pretty smoothly, aiming to be like Hazeron, so city commanding for any vehicle and also traveling on foot straight out of commanding a vehicle, if you wish.
The different kinds of cities like flying mobile cities and flying stationary ports would be great, and floating cities too. Land cities on their own would be pretty sizable on their own though.
Really the most important thing is that its varied enough that basically a load of fast engines and efficient processing plants on tracks could scavenge efficiently enough to be on the scoreboards in competition with the big mean hunter.