Think about on-going maintenance, upgrades etc.
Electronics will be easy
You'll want to locate service and parts for the engines & gear boxes in your area.
Piping, plumbing & hydraulic fittings well be a challenge. It's all going to be metric. Difficult to source in the U.S.
Numerous smaller things will present challenges as well. Appliances, trim and finishes, etc.
These are not show stoppers, but do your homework first.
6mm, not quite 1/4", plating seems a bit on the light side to me for a 20 meter boat.