I have 2 Alpine 12 inch Type R's and i need to make a box for them. I would like it to be vented, but as far as the dimensions go i have no idea. I am great at building things, so i am up for the challenge, but what i am unsure about is the exact dimensions and the port and the tuning etc. any help is greatly appreciated as this will be the first subwoofer box i have built! Might i add that i have an suv with a big trunk so i don't think that space will be an issue.