Rix Engine House Door Centers

I’m planning on adding one of these to my layout.
http://www.rixproducts.com/enginehouse_1_or_2_door.htm
Does anyone know how far apart the track center lines are so I can layout the track before I get the kit? I know the structure is 5.5"x11". Also, does this have large, overhead doors on both ends or just one? I’d like to run track all the way through it and maybe park a dissasembled loco or two out back.

2-1/2 inch center to center on the doors. The doors must be cut out. The ends are scored on the back and each door must be cut out. You can build it with 1,2 3 or 4 doors.

Cool!
Thank you.[:)]