nice work gang. i'm gonna wait a while before i post WIP renders ehehehehe
as for terrains from max ---> ued, you MIGHT be able to using something like Dreamscape or the various plugins for battlefield.
you need a simple heightfield texture, ideally about 512x512.
otherwise, if you know max... you can basically crank out just about anything in a breeze for TV. you need actorx plugin from EpicGames and/or simple .ase exporter.
getting static mesh (or even animated mesh) into ued is simple. only trick is getting multiple material IDs setup right.
i've switched to maya recently, myself