I'm an author and illustrator in the fantasy genre, and I am working on a book series currently that requires some designs for repeating crossbows with a simple and effective lever or crank action that could be mounted on the back of a very large animal, say the size of a rhino, that could be operated by a single rider.
That was a mouthful...
I've done rudimentary first sketches which led me to understand that I didn't know enough about crossbows to fake it reliably, started doing research, and began to love crossbows.
But I realized that I need to find some crossbow enthusiasts to help me out a bit with terminology and the dynamics of such a thing; I want it believable, since I will be illustrating it in the books. Then I stumbled across this site while doing research.
You can see some of my artwork here: http://www.toddlockwood.com/
Anyone interested in corresponding with me on designs would have my gratitude, and might be challenged to help invent something fun.
Many thanks in advance.