The on the water, head on shot could be Evansville. The rest are in Seattle. The shots with the Squire truck were taken on 4th Avenue, next to the Kingdome. The one showing the truck side, with the door open, shows two triangle topped towers. The one on the left is the "Smith Tower", at one time the tallest building in Seattle. The one on the right is the clock tower on the King Street train station that was adjacent to the north Kingdome parking lot. Of the three landmarks, the two towers are still there. The Kingdome was imploded years ago, its location now has Lumen Field, home of the Seahawks and Sounders FC soccer team.
I too will be doing the 79 Circus. I have the kit, the cowl, wings, etc… just haven’t got to building it. The Air Force paint job looks a lot easier for sure. I saw both the Circus and the Squire sister hulls run in Madison that year. I think Steve was a rookie and man was he charging hard in that Circus boat.