Making a default window size and preview size for folders on a Mac I work for a photography company and we have just switched to Mac for showing our photos directly to our clients when they come to our booth. The change to Mac has changed how we show our photos. We are like a roller coaster ride where it takes your photo and you walk up to a booth to view them.

Our problem is that I want to show them in a folder with a size just below fullscreen and in cover flow (with a BIG preview size). The trouble is that customers are the ones who are using them and so they will close to the window. I have 4 Macs open to customers at a time with hundreds of viewers in a weekend.

When I reopen the folder it has been saved in cover flow but the folder window is smaller (nowhere near fullscreen) and the size of the preview to folder ratio is very small for the preview size I want (again this is in cover flow). 

I want to be able to change this default sizing like I can for cover flow always defaulting. I know it would just take 10 seconds each time to resize, but a year from now that will add up to hours.

Also, what would be even better is if they close the window that it will automatically reopen it or reopen a specific window?

This is not in the program "preview". This is when I am viewing folders (read only) and they need to be viewed well in cover flow.
One way of doing that is to use the "Use as Default" in the View Options after you have adjusted the size.

Go to View in Menu bar then select show View Options.

Now adjust the size to your liking then click Use as Defaults.