Ed Sark, try reading this thread from the beginning you will find every answer to what you are asking here, plus maybe some more that you haven't even thought of yet. There are some great pictures posted showing step by step everything that has been done. Just start at the beginning and you will find a lot of great information. Luke and Hal have posted some great build pictures along with many others. There are some great pics of the retract install with Sierra's.

Randy