Of all the mobile homes I've seen, none of them has had a well planned built in hutch. They all ate floor and wall space without providing that much more storage. Buying a piece of freestanding furniture for whatever you'd put in that hutch will save space while increasing storage.
Check between the storms and interior windows. You might have to replace that bottom strip of wood between them. It's varnished balsa wood and humidity destroys it quickly.
Doors are often the first things to go on mobile homes, has to do with the flimsy hinges.
If this one is permanently set on a foundation, you can rebuild it with confidence, getting rid of the cheesy balsa wood interior they did because it saved weight. If it's in a park and you would conceivably want to move it, then visit a trailer supply house for the new doors, windows, cabinets, and bits and pieces. You'll want to keep the weight low.
There's no reason you can't pull out a skinny bathroom door and replace it with something more reasonable. Just realize there might be a reason the door is so skinny, like plumbing, electrical, or heating stuff in the wall on either side.
In any case, I rehabbed the interior of my trailer, redoing floors, peeling wallpaper and taping and mudding the drywall under it. And taking a crowbar to that stupid hutch. Mine was about half the square footage yours was and I loved it, every inch but that hutch was well planned space. If I could have had it moved to this part of town, I would have.