As far as circuit board goes, mist people think it is stronger than lexan, which it is on paper (data sheet) in many ways, but in practical fishing application I prefer lexan because it just seems to hold up better in general for myself. Also I like the fact that because lexan is clear it does not add to the "profile" of the bait. But as a hobby lure maker I find that it all depends on your desired outcome.
For a lip source, I like CB Custom Lips. They do all work custom so you can get any size or material, and they are priced about the same as other sites that don't offer custom designs. Here's the website:
www.cb-custom-lips.com
Please repost on your progress... I am very interested in walleye crankbaits myself!