craigd, I do have "Single Shot Rifles and Actions" by Frank DeHaas, and it does have a good drawing of the internals and parts identification. I found another online. Numrich/Gun Parts Corp is another good source for some exploded views, but they had nothing on the 44 1/2. The DeHaas book has a few basic dimensions such as the width of the action. But there is none of the detailed information concerning screw, pin and thread sizes. That one casting you mentioned is the two triggers for double set triggers. The trigger plate/lower tang is set up for same, but I considered the possibility of going with a single trigger. It would be interesting to know if I could use the same parts, and set it up as single trigger, but fairly easily go to a double set arrangement if I changed my mind. The old Rodney Storie kits came with two different types of lever/trigger guard to apparently go either way. But for some reason, this has two of the same spur type trigger guards, The triggers are still attached to the casting gate. The one part I'm not 100% sure of is the small part directly below the hammer. I'm not sure if that is the stirrup for the mainspring and hammer, or something for the set triggers. The nub on the left side of it is also a casting gate that hasn't been trimmed off.