Hi Timelordd,
First.... boy you guys don't mess around with getting pics of the heros. LOL
OK... timelordd... If you look at the pics closely, you'll be able to make it out. The front piece is a piece of copper I used. I cut it to shape and then curled it a little to match the radius of the coil. Now... this copper got a little beat up so it looks very wavy. If you look at pics of the one I made for QMX, you'll see that it isn't wavy at all. This is exactly how I made the studio guns. It should look very clean and sharp. Just put a slight radius on the corners and get as close as you can to mine and you'll be fine. Then I soldered it to a flat head screw. The connection between the coil and this curled copper is epoxy. The back section piece is custom shape etc and I machined that out of brass and is what connects the back end of the upper assembly to the lower frame. Now, I can't provide drawings or CAD of these parts but I think with what you've been doing so far, you'll be fine. I fish I could be more help but NDA is a knocking on the door. One other point I would like to make. This gun, even though it was a hero, did not have the aluminum machined lower butt plate on the grip. The one you see in the pic is cast from a mold off the hero that did have the aluminum machined part. To be accurate.... machine it out of alluminum. Again, I can't provide details on the CAD or give drawings out but I think you'll be fine with pics off the net. Just zoom in on the pics and I think you can make out the details.
Sorry I couldn't be more help.
Kenney