I just got word from Wim Harwig:
“That young guy you saw at the M5 recumbent-shop in Middelburg is now in a team of young students trying to break the world record. I think you took a photo of him when he was working on his wooden low-racer in the shop. Probably you inspired him as a world record holder too His name is David Wielemaker.”
Good stuff! That young guy is the guy in the photos below (taken on July 26th 2007).
Here is the video that Wim linked to in his message: