After reading the same article on Bikecommuters.com concerning Ann Rappaports' DIY Porteur rack using the shelf standards. I thought "what a neat idea". So off I go the Home Depot to check out the materials to make myself one. Grabbing two or three lengths of the shelf standards. I thought about how heavy they felt. So I walk around looking at other materials and I notice Aluminum angle iron sitting there. Pick it up and notice how much lighter it was than the shelf standards. So I get that and some electric conduit to fabricate some struts. And this is what I came up with. Using pop rivets to join the aluminum together.
It works OK for light loads. I gave it a weight test using a concrete block and the struts didn't hold up so well. I think the P clamps had something to do with that. I'm going to try re-fabricating the struts to fit into the wheel axles like the Cetma's do. We'll see if that makes a difference. Since the pictures were taken I've also added a cross strut going from the fork to the rack strut for extra bracing.