Just a quick note to check your local ordinances and code requirements regarding your structure. Once you pour the patio, you limit your options on anchoring the structure without cutting holes in your new concrete and the available options may not meet local code.
I learned this the hard way. We had extra decking poured to add a pavilion after the pool was done and found out the city required a 150mph wind load (we live in a hurricane prone area). I checked with a few structural engineers and found to get a proper anchorage for the structure I would have to break holes through the decking to pour footers in order to meet the wind load requirement. Needless to say, we don't have a pavilion.