We have to here in florida - it is 27' X40' with a 8' covered area with gutters - about $13K. It's the only way we don't get carried off by the bugs (and it helps to keep out the snakes). There are very few pools in FL that don't have the screen enclosure.
It can be DIY - I have a friend at the office that added onto his - check local building wind code (I see your in TX) - we have to install cement footers and lots of ty-downs. In my area it must withstand 120mph winds without ripping off the house. They did major damage to neighboring houses during the hurricanes in 2004.
The frame is aluminum and has slots in it to secure the screen - similar to the screen frames on windows. Then they just bolt them together.
Here is a company I found that has a location in TX. http://www.screenenclosures.com/
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