Keith,
The "one-piece" radius shower we use "will not" go through your front door. Even if you brought it through a removed rear window, it likely would be wider than your stairway and/or bathroom doorway.
This said, there are companies that make 2-piece radius showers designed to come through the door. We don't have access to those as we don't use them. If you are serious about doing this and want to come to Elkhart to have it done, there are several shops in town that could likely do it. Consider calling Ron Green at RV America at 574-596-6685. I've seen his people put these in with the same self-storing shower doors when the make the American RVs from a OEM supplied 5th wheel shell.
Moving this thread out of LM ATF and into LM Interior.
Jim