Thank you for the pointers Drakous! And apologies for not getting back to you earlier - it have been some busy weeks. Also, I was expecting a notification email for replies to this thread, but somehow I never got any. I'll keep trying the model export stuff and report when I make progress. It's for a moonlighting project (prototype: http://operation-survival.appspot.com tentative plan: http://blog.buschnick.net/2010/01/operation-survival-humaties-last-stand.shtml), so I'm not particularly fast.