You need to be a special kind of nutter to do this! I loved it.
There are many that are trying this sort of stuff but very few are getting that low.
I did some Extra-300 aeros (with a 5000 hour instructor) 3 years ago. I had a go at the "Redbull Airrace Slalom" at only 175Kts with a virtual hard-deck at 1000'. I apparently did pretty well... but it wasn't at 40' or at 220Kts. The instructor commented that he didn't have the guts to go below 200' doing that sort of flying...
There was a video of one of these guys who misjudges a gap. And believe it or not he did survive. He had several broken things and was in bad shape for a while, but he is back jumping again. I guess some people are missing a screw or something..