Steel Guitar Builder

Hey guys, I am dreaming of building my own universal 12 string pedal steel guitar with 7 pedals and 5 knees, any suggestions on how to make the endplates such as opening size for pedal tunning end and the pedal changer, or any other advise on the layout of the guitar, or how to begin?
Steve B.

Thanks guys, I will check these out, I did notice that when I push harder on the second pedal or a little further down it would come up to pitch, but this seems like a lot of extra work and force on that pedal to get it to come into pitch, I have it posted in the for sale section of steel guitar for...

I have a new updated changer in my MSA Classic U12, the issue I have with it is that the B pedal or second pedal when pressed and then released pedal comes back to normal position but the 6th string is out of tune always flat not too flat but just out of tune, what is causing this and how do I fix t...