Here's just another idea for the use of the space. Black circuit is 081 minimum on the bottom level. Above that in red is an over-and-under double main with one line that is 072 min and one that is 063 (though the 063 line has a lot of 081 in it). It could use a lot of work to make it more interesting, but it's a start. Are you set on the idea of an L-shaped pike along those two walls?
Todd