Plumbing Help Please!!?

I am tearing out a bathroom and the old shower was a built in Neo type design. The plumbing actually comes up out of the floor and is not inside a wall per say but is just sticking up out of the concrete. What would be the best way to move this water line to either an inside wall or to an outside wall. Will putting 90 deg turns in my plumbing decrease my water pressure. I am thinking about building a small wall that will go inbetween the shower and sink that could hide the plumbing as I move it towards the inside wall. The length from where it is now to the inside wall is approx. 3-4 ft and would entail at least a couple of 90 deg. turns. To get it to the outside wall is would be approx 5-6 ft and entail at least 3 to 4 90 turns. Any help would be greatly appreciated. The plumbing is copper coming out of the floor. Should I convert it over to pvc? It is a small bathroom so I want to go with glass on the outside shower walls and want to tile the inside to make it look more open