If you
click here for the DIS page about touring with mobility disabilities , you will find a list of attractions where you can stay in the
ecv for the whole attraction. There is also a list of rides where you need to transfer from an ecv to a wheelchair plus rides where you will need to transfer to a ride car.
If you go to the link that I listed in my other post, you can download copies of the Guidebook for Guests with Disabilities for each park. They don't give a lot of detail, but are helpful since they indicate which rides have moving walkways for boarding, etc. They don't list the rides with boats that have a long step down - Pirates, Norway, Small World and Mexico. The Mexico ride and Small World have wheelchair boats where a wheelchair can be driven right on, or you could use that boat and walk down a ramp to get on.
Have fun. I'm sure your 72 days will go really fast.