Development of envolope

Development process of constructing an envelope that will be used to connect with my stationary I have added dimensions with the image. I found that these dimensions were too small for the letterheads so i am currently in the development process of re-constructing a new letterhead envelope for my stationary set. I conducted this envelope on illustrator. After my final print out of this envelope, I printed the envelope out and used the lines as guides to fold the five pieces to then all be connected to be completed as the final. This mock up was too small to use. I will be developing an envelope with a larger dimension.