Do you want to spend time in your garage or on the water? sadly I do spend more time in the garage than in the water.
Do you think you can build a light, strong, fast boat? light I dunno, stron yes, fast, we'll see.
Do you think you can build a boat that you can trust you and your families life to? yep
What kind of re-sale value would your boat have? dont really care much for a resale value, the value is at "I built this project with my hands"

You could easily spend as much money on parts as what a good used boats would cost you. Yeahup this is a very true statements that applies to everything in life. But its diferent when you actually build it yourself from scratch