I have a partially finished basement bathroom with a 1.5" drain line stubbed out underneath the surface level on the concrete floor. All the work from there is done, goes into an ejector pump that the current working sink and toilet use. I was thinking, installing the shower will be easy but then I realized that the drain is not centered at all. I have thought my only option would be to have a base built from scratch to line up with the drain, but is there another option for this, like a slightly raised base with enough room to reach the drain?