Quote Originally Posted by mgb74 View Post
There are drain fitting that eliminate the need for a separate vent pipe. Not sure how well they work but they would greatly simplify your plumbing.
I have no idea why you would need a separate vent pipe.

Quote Originally Posted by CPorter View Post
My only concern about these plumbing plans is that I will have the drainage properly vented, I'm going to rely on the plumber for that.
If you are going to do the hot and cold yourself then don't waste your money on a plumber for the much simpler waste pipework.