Just from having been there, I assume you would be able to do most of it on a slimmer
ecv. There are elevators for all the levels and the hallways are generally wide. My concern would be more places like the cargo room and some areas of the engineering room would be a bit tight. I think it would partly depend on how comfortable you are at using an ecv as well.
Getting there, I’d say you could arrange an accessible transport? Or possibly have the ecv dropped off there ahead of time - when you book they should be able to help with it.