No we never actually did get to build the Oostenbrink elutriator, but we did manage to get a Seinhorst cyst elutriator build a couple of years ago, which is very much the same dimensions. A company specializing in stainless steel manufacturing built it. It was quite expensive, but I can not remember the exact prize, as it was at my previous job.
Dear Rinus, in the Nematology Laboratory at Universidad Nacional de Costa Rica, we have these two Oostenbrinks. Maybe the photograph can help you see the dimensions. Regards