Not a Topaz - it's a Cruz (and he has a choice of two of them)
(Topaz is a moulded plastic training boat, and, once they've gone soft, they're shot.
Cruz is GRP - which is repairable - and originally had a cat-ketch rig, one mast at front and one at back. Didn't sell well, probably because of the unusual rig, but owners seemed to like them. Bill Sargeant I believe had one before he built his Paradox)
I've just seen a pic of a ketch or yawl rigged version; the tiller and extension have to be passed behind the mizzen and under the mizzen sheet horse every time you tack or gybe. I would soon get very tired of that, but the hull seems nicely shaped and ideal for fitting the rig of your choice.