Got some gaps in the foam board...how to rectify? - Model Railroader Magazine

The board is off on one corner, and it may be my house.  I checked the foam board with the level on that end and found it WAS level, just not the plywood.

I honestly don't have the time or the will to make a frame and/or a table to do this right.  My father has offered his services, but he gets as busy as I do, if not more so, and he lives an hour and a half away.  Hence the sawhorses.

The cut in the foam was done with a handsaw and was not a clean cut, much as the guy who cut it tried to make it one.