I'm about to start a 20" fat tyred swb recumbent, being currently in the collecting parts phase. Work will start this weekend. I wanted a set of 26" wheels initially but almost all secondhand ones come with knobbly tyres attached and I'm no fan of using them on the road so I've plumped for a set of 20" ones off a Avigo Monster. Managed to pick up the whole bike for £60 - it was that little used that the tyres still have the manufacturing flashing on them!
In the meantime here's my previous efforts.
In the meantime here's my previous efforts.