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Ah the plot thickens. Now when I add some page content that shows up but the form doesn't! 
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You should read up on Custom Forms in the Manuals.
What you just did was tell Matrix that you wanted to customize the page contents, which means that it won't print out the fields for you automatically. You now have to do this manually using keywords for the labels and fields as well as building the layout. Doing it this way IS the way to go in my opinion as you get so much more control.