Yep boat building similar trades. One of my best guys was a boat builder by tradeInteresting thread (in parts). Top marks to Tadge for posting the opportunity. Clearly few are super skilled in everything, but I reckon I could do most of the things there with some signed off by another (eg gas). (I a not an applicant by the way ). My brother (had he not had a stroke) is hopeless at woodwork, but he would have done all the gas, electric (both qualified), metal fabrication, welding, etc in his sleep. So there will be people around who could do it.
My brother had one of these VW vans which he fitted out (I made the cabinetry woodwork for him). He used to fit out barges when he was an apprentice and reckoned doing a custom van was music the same. They had most of their holidays in it. I hate camping but I know some people really get the bug.
Hope it all works out Tadge. Ignore criticism - it's the only way to succeed in business!