This is fascinating. I've seen papers and demos on such implicit surfaces before (quite possibly yours), and while it's impressive what models one can build up with some imagination, I'd love to see something more than toy examples.

Would it be possible, for instance, to do the things possible in b-rep kernels like extruding a surface, or importing an SVG/typeface and creating a solid out of it?

I'd really love to see a fast, open source, kernel that can support such things and also parallelise well.