I fear the long center part of my space is not wide enough to have a center peninsula.   Building it temporarily has allowed me to take some real measurements.  If I go ahead with it I'm likely to have less than a foot available for modeling on each of the side walls----after leaving three foot aisles on both sides.  I better do some more drawing.  I don't want to compromise on my minimum aisle widths.

Maybe a plan having simple around-the-walls benchwork with no peninsula would fit better.