HO bed room layout needed

Hi all recently my wife and I bought our first house, I have a room in the basement 12 x 15ft with the entry door 2ft from the end of the lower right 15ft wall.
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I would really like help and suggestions on how to build a layout HO scale around the room still leaving the center for spare bedroom. 1930's rural/small town grain belt era. Would like to incorporate a small turntable for 10 wheelers and consolidation class locos. :confused:
 
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