Yes, you can fit a 12" deep bench in a 55" long shower. The 32" width is not ideal. See if you can expand your width by about 4" to accommodate the curb, making your actual standing area 32" wide. (The curb is that little build up between the bathroom floor and the shower floor, it keeps the water in and allows for the shower pan slope, necessary for proper drainage.)

Thank you, Camian! I have always loved this bathroom. I misspoke about the dimensions for my shower area. I actually have up to 66" for the length of the shower (there is some dead space where the shower controls are now), and I could squeeze another two inches, along the wall, so the maximum space I have is really 34" width with my existing layout, or 34" x 66" maximum.

Glad you like the bathroom, they were great people to work with on this traditional Santa Fe style home. Best of luck with your bathroom!

Thank you, Camian!