Are you thinking that you can remove the existing tub, then buy a new tub with the same overall dimensions but no shelf? You probably could do this, since there are a boatload of RV-oriented sink and tub makers. Are you thinking that this would gain some space on the tub floor? Maybe not. The shelf in the tub is not there just for looks or convenience.
Before you take yourself into this mod, I suggest that you remove the brown converter cover in the hallway, then pull out the entire converter. It is probably bigger than you think. Even if you could find some way to put a waterproof box over it, you wouldn't get more than a very few square inches of added floor space, since the converter occupies most of the space under the tub shelf.
While it is out, look at the mass of cables under there. How would you handle them?
And finally, if you pull the tub out, you will have to find some way to handle all the plumbing that is under there. The tub drain, the tub faucets, the outdoor shower, and more. Everything that goes to the gray tank.
As others have said, think this through very carefully before you commit yourself. Removing the existing tub generally requires destroying it. If you need to back out of the plan, a new one is very expensive. And re-installing it once the walls are in place would be a major job.
Let us know.
Bill
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