I was looking for something from Clyde a while back but I got the impression it wasn't trading or never got going. I don't really know.
On the other hand, if you're looking for paddlewheels I stumbled on somebody on eBay a while back. I posted up details on here but can't remember where now.
Their eBay name is
eliteguitarplans. "John Anthony Guitars".
(I can't seem to remove the hyperlinked hidden text above -it's
https://www.ebay.co.uk/usr/eliteguitarplans)
I thought it a bit weird someone specialising in guitars with a sideline in paddlewheel kits but you never know!!...I bookmarked a paddlewheel kit from them which they had listed as about £48 if I recall, though the listing has gone now and I've no references for anything re-listed since. If I recall they were offering something like a pair of 100, or 120mm diameter wheels (non-feathering).
No idea if this is of any use regards paddlewheel kits rather than hulls but I thought it might be a response as never seen anything off the shelf since the old Graupner offerings. I consider a hull easier to build from scratch than the actual wheels.
Cheers,
Rich