104870 miliondollarhomepage type site

I want to build a pixel ad system like [login to view URL] but mine will not be the normal 1,000,000 pixels... My pixel area will be in the shape of a house (see attached for a rough suggestion). Ideally, I'd like to have a minimum of 750,000 available pixels in this house to sell. I would like all the 10 x 10 clusters to look like a brick... users will choose which bricks they want to buy and their ad will go in that place after they make payment via Paypal. I would like to have a total sold and how many people are online. I want this to function the same way with the popup when you put your mouse over an ad. I will also need a easy way to remove ads if someone should post an ad that is not accepted. This should be built in PHP with MySQL database (if needed).