Being part of the EU, I would guess there would be a boatload of regulations to comply with, since your plan is a commercial venture concerning passengers and /or sales to the public. Maybe plywood wouldn't be allowed, I don't know. Maybe flotation tests, possibly inspections before, during and after construction. Liability insurance here can be monumental. You can easily lose everything you own, here, if you lose a liability case in court. Or even if you win, you could go broke paying a lawyer to defend you.
But yeah, the boat could be easily and quickly made if you have a plan and money and facilities and materials and tools and competent workers. And a market would help to possibly make it profitable.
Yes, we are in EU, but we have our law as well. And it says, that boats until 6 meters (which is the case) does not even require being registered. And boats with engines less than 10HP doesn't need any license to operate. My rent business idea is based on these two laws.