They say a picture is worth a thousand words..... well, I grasped in an instant what you'all have been trying to tell me (from sdsester on) about level vs measure and about raising my plywood up onto another sheet of plywood/2x4/styrofoam to cut it.
Thank you Carp Enter for taking the time to draw out the pictures of the level wainscotting in the crooked little house. My brain finally gets it now! And thank you as well MT Stringer for bothering to think of me and set up your cutting station and send in pics. My cuts never look that smooth (not yet, anyway!!).
You folks on this forum are so helpful. I am really learning a lot and I will keep coming back here for your guidance. I appreciate how there are so many different voices chiming in. It makes for a more comprehensive picture of the task.