Hi Kevin,
I think that the tyne models hull is the only one around, not heard of any others, I think, not 100% but chipchase may have made the plug and mould. I got mine from a deal with another club member. Dont know where he got it from, but it had some of the clearing ports cut out, but thats all, I have been at a stand still with mine for a while, too busy with work. (Only 6 years to go ).
Regards Andy