Clarity - This is the way it is already. There is a tub in the middle there with sliding doors that allow access. This is common in the houses in my neighboorhood....
Northcrest Modern
I have found a place that sells the shower pan, but it was the non sliding doors part that I was having issues with. The corian sides, that is the answer I think.
Here is another pic, I did a Google search on jack and jill bathroom and this came up. This is from one of the houses in my hood, it's looking from the master bath, through the tub, into the guest bath.
I just want the shower...no need for the tub...does this make more sense?