The painters tape trick worked great. We cut the plywood into 3 pieces, 2 measured for what I want and the third is the leftover. All the plywood, Homasote, and Masonite backdrop sections are behind a rolling cart on the other side of the room. Now it is time to start putting up benchwork on wall number 2. Yay!
Don't worry about the baseboard heater. 
It is disconnected. I get enough heat through the door and window opening to the main part of the basement. 
