Strong work! I guess you have seen this one, similar concept: http://www.fixedgeargallery.com/2007/dec/3/HuwGwilliam.htm
Yes, that was what persuaded me that a fixed Brompton would be possible, despite everyone saying it isn't. On his Flickr pages he says he can't skid it though. Pity there are no close-ups of the chain tensioner.
@Brommers started
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Strong work!
I guess you have seen this one, similar concept:
http://www.fixedgeargallery.com/2007/dec/3/HuwGwilliam.htm