Excellent, that's a great start. Vince - thanks for the measurements, I will redraw a better 3-view using those. Not sure about how the extra bolt goes though. Ethan - thanks for confirming the different leg pad to frame pad. Noel - that is extremely useful info on the pads, I've now found them at http://www.vlier.com/product_index/leveling/sel_05_lstar.html# Paul - yes I noticed some systems had different legs, for instance this one https://c1.staticflickr.com/3/2435/3878202215_372c46fccb_b.jpg and any p/n info you have from better sources would be welcome.
The part number I found for the legs (H-952-BA) came from the Fall 1978 Digital Sales Catalog, page 129 which has the same p/n for both Standard and Short cabinets. I'll cogitate over a revised drawing and get back to the list. Thanks again, Steve.