UPDATED 6/27/16 - Sheesh... yet another TTT on an old how-to.... you'd think I don't have any original thoughts to share. Seriously, since I'm done building and spending all my time driving, I don't have much new to pass along to you guys, but thought these old posts would be helpful to someone.
Original post follows.....
In an attempt to make it so I can remove my dash with the body in place - and because my rolled cockpit edges cover a significant portion of the upper dash... especially where the cowl meets the door... I added drop-down tabs that I made out of some scrap .040 aluminum. The brackets are about an inch wide and are bent 90 degrees, then attached to the underside of the top 3/4" dash support tube using adhesive and rivets. I then drilled the brackets and added some clip nuts for use with sheet metal screws. With some stainless oval head screws and finishing washers, I'll have a fairly period-correct dash mounting method and a good chance of getting it out with the body on.