Hiya Mark, welcome to YBW forums. I have been interested in this market for the past 2 years and more importantly and not often mentioned is another fundimental.

How many engines, cruising speed and number of litres an hour per engine.

I did look at a boat the other week and discovered the fuel consumption was 45 GALLONS per hour at 17 knots cruising (top speed 25 knots!

I created an Excel Spreadsheet to do the maths and I am now looking at a full displacement motor yacht which has a top speed around 6 knots and a tank capacity of 2500 litres with those sort of figures I can expect a range of 2,000 miles. I have a very real reason to go for range over top speed. It might be worth thinking about

Once you go semi-displacement or full plane, then your fuel will disappear as if being drunk through a straw.

Good luck