I have been giving this alot of thought and I have come to the conclusion that staying to exact scale is NOT neccessary.
In the scale I am working in (G) you run acriss alot of different actual scales.
Anything from 1/32 to 1/20 and all points in between.
I have tried to stay real close to 1/24 and 1/25, but some things are just too hard to find.
I think all in all if you are close and make perspective an added issue, you will come out fine.
Like taking the smaller scale 1/32 and using it as background because it would look smaller if it were further away.
Also if you dont have things of different scales close together, its not as noticable.
Having a 1/32 scale auto and a 1/24 scale auto sitting next to each other just wouldnt look right in any scene.
But, having a 1/24 scale auto, and a 1/25 scale auto close together, you cant tell the difference.
Just keep in mind the idea is to have fun with it.
Build buildings in the same scale if possible, but it doesnt mean you cant have smaller buildings in your layout.
Make some in a smaller scale to sit behind your larger buildings to give perspective to your town.
Gives it depth and makes the eye draw into the scene.
Just make sure with the smaller buildings, you dont use people of the larger scale close to them.
You wouldnt want a 8ft tall man trying to walk through a 4ft door!
This is an ongoing project of mine to see if I can find some interested people to throw in their 2 cents worth of ideas.
Hey, even the wheel was invented at one time.
Thanks for reading this and I am looking forward to any and all comments!