+----------------------------------+
|............................+--------------+|
|............................|.........................|| Horn
|............................+--------------+|
|...............+....................................| Centre of Kilomax
|......................................................|
|................................+-----+..........|
|................................|..........|..........| Port
|................................+-----+..........|
+----------------------------------+
Height = 18
Width = 36
Depth = 13.5

help with port size? and whether this positioning of port will work?

thanks everyone
Craig.