Going to cast them first then machine what needs to be. I will cast them in aluminum first since I cannot seem to get brass right but if all goes well may have some cast in brass.Good start! Do you plan to completely machine them, or start off with a casting? Have you decided on what material you'll use? I've always liked the looks of the original Stelling and Hellings version. Your design looks real similar.
Regards,
Geo.