First Injection Mold

This is my design for my first injection mold. I download a mold base from PCS here http://www.pcs-company.com/viewitem/Mold-Bases/Aluminum-Standard-Mold-Bases/AL-88-24-24 I plan to mill this on my cnc mill, but I want to make sure that I have a viable mold design. Any input on this mold would be greatly appreciated!! Thanks Greg