Stargate Yard Redux

Since I have a new, better Stargate model, I decided to do a new, better version of the only real picture I made with my first Stargate model, namely the ‘gate in my backyard. I also added a little something to allow the inner ring to spin freely. I’m not 100% happy with where the rendered concrete meets the real concrete, and something seems off about the scale and/or perspective of it, but I don’t know how to deal with that.