No the collars are still mechanically fixed to the hull, Carson always mechanically fixed collars for ease of change. They had a flange attached to the collar which would go either side of the hull you have and then boundary bars on both the inside and outside through bolted. Barry may still have some spare collars so will be worth waiting for his response or feel free to email him on email@example.com
and if he hasn't got any of the old type in stock he will be able to advise.
Yes we have got the 4.2, 5.2, 5.5 & 6m Carson moulds and Barry is almost finished the design work on our new Interceptor class of Carson RIBs which will be 7.5, 8.5 & 9.5m in overall length with semi wave piercing stepped hulls, in addition all the classic Carson features will be incorporated
The first order is due for delivery late summer.