I've seen pics of one or two RWS trikes. With a trike, balance isn't a problem. The problem with RWS is that getting it to go where you want is not intuitive, making them extremely difficult to ride & nearly impossible to balance. Even as trikes they required massively-stretched wheelbases to bring the weirdity down to a manageable level. Havng FWD is not a problem, though. Zox does it, Barcroft Dakota does it, Cobrabike does it... You can even get a kit from Cruzbikes that converts a dual-suspended mountain bike into a FWD bent.