I would like to build a 12'x14'screened-in back porch attached to my two story house. I have already poured a concrete slab with 36'' footers. I would like to buy plans or a video that would take me through the steps for building. I would like to use a gable roof. I need recommendations for materials since i live in the midwest were the weather is very hot and very cold. If you have any ideas for a plan or a video, please help.