AS RECOMMENDED ABOVE, DO NOT TURN THE ENGINE OVER! The fuel in the engine, in the hoses, in the tank, is all contaminated, full of solids, probably water. You do not want to introduce any more of it into the engine. You have to get the whole system cleaned out before running the engine or even turning it over.
The exposed hoses most likely should just be replaced. I'm not sure how to flush the engine, but an expert at a shop can tell you. The fuel in the tank and the hoses from the tank to the engine has to be expertly flushed and dealt with, which is not inexpensive. Gas disposal charges are many dollars per gallon, but it has to be done. Using the gas is much more expensive
I do think that since the boat has no wooden structure, it can be cleaned up and made serviceable.
Does that engine have an oil injection system? With a little tank for the oil? If yes, and the pump is what I once had, a diaphragm pump, that pump will either have to be replaced or rebuilt. The hoses also should be replaced. The diaphragm pump was a crappy design to begin with, and it most likely has been damaged by the ethanol/water/old gas. Do not trust it. If it fails your engine will fail. If your engine is running when it fails, your cylinders will be scored. There is no warning. I know this from experience.
As others on the forum have said, I appreciate your service and hope you pursue getting your dream back on the water. I think it can be done, and if you do it, you will really be proud of what you have accomplished. I wish you well.