arun 54
There certainly were 2 types of Arun,and these where very much different.Some where made of wood and the later ones of glass fibre composite.There were 52 footers and 54 footers.The sterns on some were very fifferent to others.Adrian Clutterbuck as already suggested is a good man to contact and by joining the Lifeboat Enthusiasts Society, you will gain a whole load of information.I think you will find that the superstructure supplied with most models,is for a 54 foot version.
Hope this helps
Mick F