Thanks for your thoughts Oldeast, but I disagree, perhaps I didn't explain the context and its setting.
The scene is about 5' deep before you get to the tank. There are buildings in front of it. Originally, Holder #2 was going to be painted on the backdrop, in proper perspective and proportion to the distance from the viewer, but I chose to model it instead, slightly under half size in 3D, at about the size I would have painted it. (I will also have LA City Hall painted in the distance....surely you're not suggesting it needs to be 34" , or 454' scale feet tall?) Anyway, I have it mocked up, I think it looks good, and I hope you like it when I'm done.
Thank you for your interest and constructive comments.
Otto K.