In this underside view of the finished vehicle you can see where the
"tank" was and the cut across the chassis just to the right of
the brake cylinder.
Now test fit the 2 sections of the floor without glue.
Do not fit the metal weight back in place as it is too long.
you are happy that all is OK, run a small amount of liquid
polystyrene glue with a small brush along the join between body and
chassis. It only takes a very small amount of glue to hold the body in
place. The glue shows as the shiny dark-brown marks in the picture.
Be careful not to get glue in the coupler mechanism. To be safe, drop
some powdered graphite in to the coupler mechanism and keep moving it for
a few minutes.
Carefully carve off the handrails
which are on the corners where the brake platform used to be. Save
Fit the metal weight INSIDE the
body. The only problem is that it is visible through the open door. If you
prefer an open interior, find some replacement weights to go in the ends
out of sight.
That is about it. If you have been
careful you could use the wagon as it is, or you can repaint it before
putting it on your layout.
It took a little over an hour to do this conversion (without painting),
a good introduction to "kitbashing".