PRR F-22 Flatcar

Hello,
This is a PRR F-22 Flatcar I am working on. The car is scaled for G-Scale 1/29th
The is in half so 2 will need to be printed. There is a recess hole for a 6-32 nut and 6-32 screw to hold it together.
I am planning to use 3 of these cars in a set to model the Naval Gun transportation during WW2

Update 3/12/17:
I added an updated F-22 Flatcar half to the files.
The new file is cut in half on a different plane and the screws that bolt the halves together are now on the long axis of the car. Also added to the car are bosses intended to attach the couplers. The boss where the trucks mound have been lowered so a washer can be added. This was change so the friction could be reduced between the truck and the body.

Trucks for this flat car can be found at:
http://www.thingiverse.com/thing:2165853

Coupler for this car can be found at:
http://www.thingiverse.com/thing:1126262

Update 10/30/17
I finally got around to working on the Naval Gun Load for this flat car/ the p