These days there's a nicer and cheaper way than using Sprayment. It's in the form of Post It glue sticks. Coat the back of the vellum tracings and allow to dry for a few hours. Then simple press the Post It templates onto the wood and cut along the lines and do any final sanding to shape. Peel off the template and stick it onto a sheet of paper for storage. And best of all there's no residue left on the wood if you wait long enough for the Post It glue to "dry". It never really dries of course. But you need to wait for it to reach the proper level of long term stickiness.

Also with Post It glue you don't need vellum. A GOOD AND ACCURATE photocopy will do nicely Or even a tracing paper copy from some art store paper. These papers will fray if sanded the wrong way. But if you move the sanding block in a diagonal stroke so it cuts against the paper downwards against the wood you'll get lovely results.