I build a two Salamander Archetype clones flexi-racks,and I wasn't happy with the results,the flexi-racks were unstable and wobbly.Here is my suggestion.The distance of the hole from the edge should be double the hole diameter.Go for 1" or 1"-1/4 rods brass or stainless steel.The shelves could be 2" or thicker maple,for hardware get a machinist to turn some donut shaped brass fateners instead of regular "nuts".See the Mapleshade Samson rack for inspiration.Yes it won't be cheap but quality never is.
Regards
George
Regards
George