What a fantastic project @Focusmarine. I'm looking forward to reading more about it. Have you got any photos of the boat you can share?
I trust other Workshop members will be able to provide some suggestions for you about potential finishes. Perhaps @Simon might be able to assist?
Let me also extend a very warm welcome to Workshop. It's fantastic to have you join the community. I'm sure you'll find plenty of like-minded people here who love to get stuck into D.I.Y. projects and share their experiences and knowledge.
Good luck with it.
This site suggests that these days Ash is favoured for internal fit-outs only. Unfortunately it doesn't say what treatment they would recommend.
Have you got any photos of the boat?
How is your project going? I'm sure I'm like many members of the community and would love to see some photos.
All the best,