In the past People Have created many parks together. they worked together by uploading them to the Steam workshop
and then downloaded them. I think there is a easier way. With multiplayer you can invite your friends to come help to build. That would The process way faster
and very fun
It's an interesting concept for sure. What about adding the feature of making both parks part of a franchise. Where you share a budget and the profit or loss of profit by one park can affect all of them as a whole. Think like all the parks run by 6 flag or cedar fair.