I wanted to point out Ben's post in the forums for his new thruster design. His description is great, so I'll save you any repetition and just point you there:
I also want to highlight that Ben is asking anyone in the community with access to precision machining tools if they'd be willing to help prototype. I think this could be a really excellent use of our collective abilities - not only sharing ideas, but also sharing resources to co-create new concepts. Anyone?