I plan on doing my own doors eventually with a full dynamat job. Probably build my own speaker plates or you can buy them from a few site vendors.
The key is to mount the wood to the door first and have it sealed by working the Dynamat around it just like how blurynsx has it pictured.
I did something similiar for my s2000 and now the door "thuds" when closed like my BMW M3
What are you looking for in terms of the install? If you ask me, labor and who you pick is more important than what components you buy.