"...settling
Italy."
Do not forget EU-import procedures. As European citizen, I read you are dual, but this is more of a problem here, you are not entitled for the 6 month visitors grace period. As EU citizen your property must have tax exemption (transfer of household) or tax paid. I am not a tax accountant but an EU boat owner with a yacht homebuilt in Far East, hence observing.
VAT and
import duty is due upon arrival in EU waters, not where you want to stay once. GB is not an EU
member any more. There are special
regulations for household transfers, but read the
regulations for how long you must own the vessel before importing it.
For
registration in EU it must either carry a CE-certificate (issued by the manufacturer) or you must proof you built it yourself. There are companies issuing CE certificates if the manufacturer can't, but ask for their quotation before you arrive. This is much more
work compared with a
survey. The engines need their own certificate that they comply with the
current pollution regulation.
IMHO, easier torent a boat for the US rivers & canals and rent or buy one in EU if you want to live here.
Taxes and duties are computed from the ships value at the day of importation, hence a
survey is due.
Just a few points to consider, if you did already, ignore my writing. Good luck with your project!