So far, so good with this jig. I mocked up a practice neck out of pinewood as this is my first time. I used my router table to do the truss rod slot and my center finding ruler tells me that that came out perfect. Depth too. I've already done the mortise on a scrap piece of mahogany pressed into the jig, and I've set the neck angle with the jig with the body which is already built. 3.5 mm at the bridge, check. Tomorrow the dovetail tenon on the neck - I've enlisted my 93 year old dad to hold the shop vac hose!

The Simpson jig !!!!!!!!!!!!!!!!!!!!!!!!!!!!!