Hey all, happy holidays. I am finishing the basement and the home came with a "builder" rough in for a bathroom down there. I've completed the toilet, vanity and shower water supply lines. Looking at where the shower drain is, its off center. I'm not sure what to do with it or what I am really looking at. I plan on using a Schluter system for the shower but I am confused on what to do with the drain. I have attached some pictures for reference. You will see the shower drain. I believe this is tied in directly below to the waste line running below it to the septic tank. What do I do with this? Thanks. I appreciate any help and feedback.