Hello Nik Nak, I was trying to find aome information on the caracruiser and stumbled upon your post, as it was my Granddad who designed and built them in Brundall Norfolk, and that is about all I know of them, that and the fact that my grandmother had to sew all the curtains for them. I'd love to own one now purely because it was my grandparents who have sadly both passed that designed and built them, if you're able to find any information on them then I'd love to hear it. Fred John Saunders was his name he owned a transport museum in Bedford until he passed.
Regards