Well, I guess this week the convertible 400 is popular somehow. I just have added this article to the online section: http://jalopnik.com/5751498/for-29500-this-ferrari-is-a-gran-toupee-ismo
I think I recall this one as last year it was up for sale if I'm not mistaken. This particular one appears to be a Straman conversion. According to this FChat thread: https://ferrarichat.com/forum/ferrari-discussion-not-model-specific-sponsored-algar-ferrari/252228-straman-convertible-registry.html
there have been 51 conversions made of the 365/400/412 by Straman.
Pavesi has made 18 conversions. How many has been done by Lorenz & Rankl is unknown to me. And recently we discovered at least one conversion by EBS.