Hi, I'm in Sonoma County, so close. A couple of things, your Sixties awning is most likely aluminum and may be worth more as scrap than any aesthetic it provides. Pretty lightweight too. I see some problems trying to cover up the Sonotube portions of the columns and still make the columns make sense where they meet the awning. In order to get the concrete covered you need to be about four inches beyond the metal (maybe a bit less, but I've got no measurements to go from). What that means is the new column wrap is hitting the drop edge of the aluminum. What about doing a bit of a tear down? Take out all the old metal, including the steel columns and making the end columns match the middle ones. That or knock the concrete tubes out and set Simpson AB44 with a Simpson Titen 5/8" concrete screw and post up with 4X4. Use the money from the recycled aluminum to buy cedar or redwood for a pergola bolted to the house. This may be a bit more than you bargained for in asking your question, but your return on investment will be significant here in the Bay Area.