(Ideas needed) : flipping first house. Options for upstairs bathroom???

[Chase Preston]

Above is picture from original listing purchase. Our plan is to add a shower. The issue is the plumbing running from the center floor connecting to the old bathtub. We also are considering closing off the brown door in the picture (access to the attic) and creating access elsewhere. 

Any suggestions? Can take more picture of current status if need be. Doing a complete new renovation of this room.