Why "most likely out of Al" ?
I met so many people here doubting the possibility of building a boat out of 3mm or 4mm steel plate and you...
Well, thank you for your care.
But, can you please be more specific and list down any of your concerns ??
Building a steel boat is very tempting...
If I were to do it I would simply 3D model it in AutoCAD as surfaces then unwrap it in Pepakura software then CNC cut it or print it 1:1 scale...
Were you able to find plans matching your requirements ?
Actually your requirements are exactly matching mine.