Power needs for projected layout size

Hey all, I am in the process of laying out track for a projected basement layout using mostly Fast Track and some Lionel tubular track.While I am clearly not a draftsman my crude sketch shows  current measured dimensions of the length of tracks and switches(x).While this  design will no doubt draw negative comments,the approximate size is my basis to decide on adequate transformer power requirement for operation of main loop,single train operation.. I have a few smaller transformers adequate to power independent loop and trolley line.I considered a  MTH Z-100 for main loop, I am running all postwar Lionel and MTH locos, (90’s vintage)some with PS1 capabilities so I need horn/ whistle feature on main transformer . I do have additional Lionel 5906 buttons also.I need to include a track section to power a Bluetooth Thomas train for grandson to run independent of traditional transformer power and also have a few Fast Track 612052 crossing accessories. Anxious to start benchwork so this I a start.