Custom fin for a custom SUP

About a year ago I shaped a 12' SUP to use as a frame for a hovercraft. I decided to go with a different frame that doesnt tip so easily for my hovercraft and am now left with a 12' SUP. Being that I love SUP'ing and was already in the market to buy a second SUP for my wife, this worked out perfectly. We took it to a lake this weekend, and it performed great accept that it didn't have a fin. So I designed this fin to be attached to a board without a fin box. I am going to epoxy/screw 1-2 of thes