It installed just like your drawing

Dear Joe, I went to Home Depot and got a new hammer drill [the old one crapped out] Bosch 1/4 in. masonry drill and 5/16 tapcon bolts 2 in. Installed very nicely. What started out as a utilitarian need for a handrail turned out to be an architectural enhancement to our home. How cool is that! Will send you a photo tomorrow. P.S. It installed just like your drawing, but we spaced it 3-4 in. from the home, and think, as you said, that the base plates will be sufficient for strength. Thanks again, Peter