Good onya old fella No offence meant! as a retired tradesman myself I can appreciate all your thoughts and ideas. Sadly I canny do what I did before, much as I try, the auld body says yer not on.
Here is an Idea for you, get a hold of an old BMC 1.5 Captain Diesel and strip it down to the bare bones. Then rebuild it to your satisfaction. Bung it in your new boat there wan job done, or sell it! If yer new project has a leyland thornycroft wear ear protection, it is without doubt the most noisey rattly engine I ever had the misfortune to listen to fur a week, it was murder polis! That was on Alpha's Rapide 32ft Centre Cockpit 1983.
Iain