Well, Argyraspidai are pretty sweet...

As far as the road goes, well, it is as if someone placed the stone underneath the river... so yeah, no bridge.

It might be bad form, but I think it could be fair to shelve this until solutions are found so that other projects can move forward. Sellasia seems like a good challenge as far as the landscape is concerned; might be fun to try -- if only I could read the elevation labels on the link you posted. I'm also debating doing the Battle of Ipsus because it seems so metal.