shower add

Hi. I am in the process on installing shower on 1st floor on concrete slab foundation where a bathtub used to be. I removed the old cast iron tub and tiled walls. This is what's left from the plumbing for the old tub. Since I am installing a walk in shower, I need to removed this and replace...

Please see the attachment while noting I'm not an artist nor plumber. I'd like to find out if I'm going to be legal or what it will take to make it legal. On the 1st floor sketch, will there be a problem with the shower drain being so close to the vertical stack. Please note, there is a toilet...