Although Maiden's suggestion will make it more sturdy, the way I designed this jig, with two layers of 5/8" MDF for the sled is plenty strong and does not flex under the weight of the router on its own, especially with smaller routers. It will flex a bit if you apply some downward pressure (~1mm), so when I use it, I only slide the router, not push down on it.
Btw, I recently built Mika's neck pocket jig on the right-hand-side of my router planing jig. Two-in-one! Maybe I'll post a picture soon.
If you are having doubts about building it, don't. This is such a usefull jig. I use it so often. Thickness planing for headstock venner, fingerboard, body surfaces, etc. I don't know how I would do things without it.
Araz
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I'd like to see a picture of that. I will also be building some of these jigs in the future, since I now know how hard it is to build these things by hand
looks good, dave. I'll have to check out how your other guitar ended up too