Joop van Ooms, Giles de Rais, and Henry VIII.
The next few pieces cover stuff that was mentioned in the book; late in the production it was decided to drop the page count, so these ideas - some close to the mark, some a little off - were left unfinished.
A statue from Joop van Ooms' collection. The steaming whatever from the eyes was a little too magical, and the space was gobbled up with copy following the page drop so it didn't get reworked.
Joop van Oom's working prototype of Da Vinci's helicopter. James wanted something alot smaller and flimsier; I liked the idea of the characters lifting off from some ravenous crowd of heretic burners.
A rougher sketch of Oom's golden cannons opening fire. With the drop in page count this wasn't needed anymore and wasn't developed further. I did envision the sky full of Da Vinci choppers. Woulda been silly but cool.