Phil, I just countersink drilled all the holes. I did that on my first one and I only used 4 short hinges instead of one long one. I would expect that you may have a problem dimpling and trying to keep it straight. The metal is probably too thick for dimpling.
See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC da...@kr-builder.org See you in Mt. Vernon - 2004 - KR Gathering See our EAA Chapter 242 at http://EAA242.org