Zaskoda: I was looking for the same thing and ended up whipping one together on my own since I got a killer deal on the rack. I will try to dig up some better photos but here is basically what I ended up with.
The kargomaster rack has 6 support bars that I ended up bolting diamond plate onto with several aluminum braces & u-bolts. It's about a year old and has not started sagging like expanded metals do. Also I walk up there and load a ton of gear on the van almost weekly. The bonus of course is my awning mounts right up to the side of the rack giving me a 1" over hang on the gutters so no rain ever drips in, which is pretty nice up here in the NW. More pics to follow.