Does anyone allow any extra on the template to allow for sanding

@jonhodgson. Hi Jonathan, I used the measurements that Mark suggest. Just wish I had his skills to make it too. 
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@frocesterbill. Thanks Bill. That’s how I tried to do it but I guess I’ll just have to get better at planing and sanding. 
🙏🎶🙂🎸

I’ve ended up using the straight edge of something as a router guide and routed the straight edges of the template.

Cheers @boo. Sounds like a good idea. 
🙏🎶🙂🎸