Thanks for the kind words, folks. Sorry I've not been replying but I'm just back from holiday. Anyway, the date-wheel change how-to is about to get started as the donor watch has arrived. It'll explain everything anyone wants to know about changing the wheels.
As for strap size, I think it's 21mm. I got my watch from Precious Time and he supplied it with the brown strap. He does it with a black one too, so ask him about the straps. I'm sure he'll sell them separately.
And yes, it's a beauty.