Search the net for an installation manual for the 320. I did it this spring and the manual has ALL the dimensions you need - width, depth, etc - with pictures/diagrams.
Others have mentioned rotating the flange in the floor a little to gain clearance for doors, etcs.
If you are using PEX piping, be sure to use shark bite connectors. Everyone including me raves about them. SOooo easy to use. I even spent the extra $3 or so for the removal tool!!! Never know when you may want to change things later on.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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