[Rhodes22-list] Installing a bulkhead compass

[Alden Blackwell]

My winter project is to install a bulkhead mount Plastimo 101 compass in the bulkhead to the left of the companionway.  I am not sure exactly where to locate it.  Cutting a hole in the bulkhead makes me nervous.  Can someone provide me with dimensions relative to the companionway etc as to where to cut the hole?  Has anyone tried to do this? 
Alden
S/V Edelweiss 
a_blackwell at verizon.net