I think an important part is being missed..
substantial gainful employment ??
Usually means working a 8 hr day/40 hrs a week or something similar I believe.
I'm sure there are complicating factors in some circumstances, they can be worked out.

To clarify-
The contract mentioned has NOT been signed yet..


oh you may have missed this question by Janke-
[Have you also applied for service connected disability benefits with the VA?]