P12 breech block dimensions please

looking for breech block dimensions for length and width and height for what stick up above the stock. trying to order some wood to make a cheek peiece with and not sure if what i have found is big enough so i need to know if i need 2 pieces of this burled oak or not, decided against using my purple heart for something a little more curly looking in grain pattern.

also, if its not too much trouble, almost forgot, the distance from the front of the breech to the loading port and from the back to the loading port.

kinda like a blueprint measurement, just enough to gie me a rough idea of what to look for