On Thu, 22 Nov 2007 21:25:12 +0000 (UTC), with neither quill nor qualm, snipped-for-privacy@green.rahul.net (Edward A. Falk) quickly quoth:
Is the basic frame made from angle iron? If so, just drill through them and countersink flathead screws from the outside.
Cool! What dwg/rendering program are you using?