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I opted to do the rough arching using the overhead router method described in Henry Strobel's books. It seemed like an easy way to quickly remove material accurately. I wasn't too concerned about the speed but since I have never built an instrument, I wanted to get it done right. The idea is pretty simple. Using the provided templates and a router, one cuts the back and front to the specified height in the given regions. The trick is to have a pin on the supporting surface which matches the size of the router bit. The templates are then attached to the bottom of the plate and the pin prevents one from pushing the back or front too far. One then progresses from template to template while adjusting the height of the overhead router. I used my drill stand for that since my router fitted nicely on that one. I started with the largest template (lowest). I attached it to the bottom of the front using double sided tape and small screws. I then gradually lowered the router until the front had the correct thickness for the contour leaving a little the front a little too thick at this stage. This results in a terraced front which I then smoothed with a gouge. Maybe it is easier to grasp this with some photos. Some good references:
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