I am currently making a Medieval Crossbow in AutoCAD in my lab. I have the base completed with the trigger... I wish to get the 'bow part' done next but, sadly, I am having a hard time finding dimensions for this part and would love some help.

The main piece I have is 30 inches long and 4 inches wide.. So I will need a bow piece that will go with that. Any ideas?

Google/Wikipedia? Wish I could be more help...

I've been googling it. Only found dimensions for the main piece.. And yet that was barely enough (Had to guess on some. Still came out nicely though).