Thanks, Mark - it might well be start again time. Yes, the motion tracker was simply a box with one or two bits hanging off it, but most of the corners and edges were rounded hence my first attempt with splines. I'm not really used to inorganic modelling so I'm not sure what I can or cannot get away with - the use of a polygon with more than four points makes me cringe but it seems that I can get away with it a lot more readily with an inorganic model. Cheers again, I'll post my updates when I've got something substantial to show in the WIP.
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