The problem with that site listed by Slowpoke - it has no information about building a PEDAL steel guitar (that I can find). Links are for building a lap steel which has no moving parts and is exponentially simpler/easier to build (and play). There is really precious little about PSG construction available online. What is available is several generations behind in terms of modern changer mechanisms.
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Have you seen just what is in these things? OK, they're not as complex as a piano but they're getting close. Lots of mechanical gear inside. A kit may be easier. Try this site.http://www.well.com/~wellvis/diy.html It may help. Let us know how you go.