Kurt Hughes, a multihull designer I admire, had an interesting post on his blog about a couple building one of his 30-foot cruising cats...
It's a pretty cool cat in the minimalist vein and I like it. Fact is, I can't imagine a better 30-foot cat for cruising in.
That said, sadly, it's not really a contender for a VolksCruiser because like almost all multihulls it's kinda expensive.
The cost of the rig and sails alone would pay for a sharpie with better accommodation, more payload, a better ability to actually sail in skinny water, and be a whole lot faster to build than a cat.