Scrawling is fine by me!

Thats an approach I hadn't though of. (drawing on pic!) Its going to have animation and in someways that approach could  be the best, as I need to export  the terrain for LW intergration of buildings etc..
(Although the XStream plug sounds promising)

I could then just export the section needed for the LW part.

Will give all methods suggested so far a try and see what looks best.