Charles, Jan and Dave have helped you with some nice options. I'm kind of wishing that I had also reached out for help here when planning my layout, but I am stubborn and independent and always want to do it all myself (with colored pencils on graph paper and engineer scale) even if the end result isn't as professional or I'm kicking myself for putting in access hatches. Too late for me but I'm looking forward to seeing your build. Good luck.
Mikki