I hear ya Eddie and your right. So far what I did was a temporary solution and more bracing is in order. I am even going to sister onto the two other parallel trusses and beef them up since they are taking more of a load now.
I decided on barn tin under the floor attached to the "box" bracing to conceal the joists. I have not committed to anything yet up on the main floor to cover the circle cut and keep things from sliding off the floor and falling down onto the stairs. The hole cut edging has to be flush over 50% of the hole and the rest has to stick up 6" or so.....it's going to be
interesting.