I've taken some pictures of the 4th crossbow I just finished. That's a small crossbow (I wanted to parade on medieval fairs and stay on the belt).
Some more pictures here : http://www.licorneargent.be/les-arcs/arbaletes/reconstitution/petite-arbalete-gothique/
That's a gothic inspired crossbow (67cm with stirrup). the inspiration comes from several XVth century crossbows (leather lace on stirrup, drawings on the bow...)
The tiller is made of yew and horn plates - the lever too - that's a composite painted bow (horn-bamboo-sinew).
The bow isn't as strong as I thought first, it's 80lbs but that's good to bend with the lever (I wanted 100lbs or more, but not sure I could bend easily with the lever).