And here’s my version and plan of the Fingerboard radius jig.
This model supports settings for both 1 and 2-radius fingerboards (Compound radius Fingerboards). In this model you can get 7.25″ up to approximately 18″. If you want values above, you’ve to add 15-25 cm to the height of the frames. One other thing that isn’t present in the plans is that I’ve mounted 2 small springs between the outer frame to inner frame. You can see parts of them in the last picture of the finished jig by clicking on it. The reason for this feature is to protect the frame to not fall down sideways and at the same time make jig more stable.
Download PDF file: Fingerboard Radius Jig Plan
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Download Google Sketchup file (*.skp): Fingerboard Radius Jig Plan
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Hope this plan will help or inspire you to do faster and better fingerboards.