I am rated as a 100% permanent and total disabled veteran. My base rating is 80%, but am rated as TDIU, so I have a total of 100% rating. Do I qualify for Space A flights?
Yes, you are a 100% permanently and totally disabled veteran. That there is a TDIU rating in there doesn't make any difference, you are Category VI
On a personal note, I've never known anyone who was successful in getting a free flight anywhere. The real issue comes into play when you're trying to return from wherever you found a flight to.
I'm also eligible and looked at it a few years back and schedules were too dicey for me. Good luck!