I think the white acetal top is available from EK - not sure if it was a special order, but I think I remember seeing them a while ago.

Kibbler - I'm behind in catching up on worklogs and missed the last few photos you put up. I continue to be in awe. This is coming out so well - your planning and patience is really paying off. Also, your photography just gets better and better as well. Truly inspirational.