Moxon UHF antenna frame

After getting annoyed with spending too much time making a Moxon frame, and not enough time tuning it, I decided to create a frame in openscad. Since the UHF Moxon's dimensions put it outside what a 200mm printer can achieve, I made this one in two parts, which can be interdigitated and held together with fasteners.
There's plenty of room for improvement, but I thought I'd get the design out the door so others can play with it. I deliberately left the mounting paddle fairly featureless because