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Sponson Backing Plate Template
Here is the template I used for my hull. I've included the dimensions so you can scale the printout.
I'd suggest you print then, then trim it out, leaving some extra material. Then test fit it and trim as necessary until you have an acceptable fit. This should be close.
The attached file is a .jpg of the sketch.
Here is a link to a .pdf version. Not sure which would be easier to use... take you pick:
UL1 Sponson Backing Plate Template in .PDF
Also... before you guys start hacking an cutting... you might want to wait until I'm almost finished in case I've made any mistakes along the way or discover a better way to do things... At this point, I'm committed... you aren't yet and there may be a better way to go about this.