Hi bigdoc....i use veg tanned calf skin...its about 1mm thick, which i think is 3oz for you, sometimes i use 1.5mm. I dont make that many masks anymore, i have trouble selling them, but then again i dont try that hard!!! I think the ball tools are used for shaping flower petals for flowers on hats. I picked up a set off ebay...they are quite heavy, made from brass maybe.
Here's a pic of my other 'heads' quite the happy couple.....decorations by daughter!
cheers