A lovely message came in from classic car dealer and fellow Dutchman Jelle Blom, who helped me to some great stories in the past. He wrote:
"I bought a Citroen DS yesterday at a garage of a man named Siem Wittebrood and saw these pictures on the wall there. This Mini was built by Siem's brother in the late 1960s and it used VW Beetle headlights. I think the resemblance to the New Mini is rather striking! He drove it for a year when it got stolen in Zandvoort. They found it back a year later in the south of Holland, when it was totally vandalized. That spelled the end of the Mini."
That's a real pity as I can appreciate a customized Minis of the era like this one. It seems that the creator put some serious work in chopping the roof down and raking the screens, with some further body trimmings making it totally unique. The registration indicates the Mini was an early one, dating back to early 1960.