First of all, if you have doubts about the structural modifications given to you by an architect, I would suggest first expressing those concerns to the architect. As an engineer, I would often have contractors asking questions about my designs. I always took the time to look into their concerns, ESPECIALLY if they thought my solution was underdesigned. Any good architect would do the same.
Secondly, if this project would have any consequences for the structure being improperly designed (which I think we can say is obviously the case), don't attempt to run any sort of analysis yourself. Even if you can find some program online to run this (which I think you won't), suppose you use that program incorrectly and it tells you everything is good. Now, you proceed to construct it. Later on, there's an issue and although unlikely, it could end up in court. What will you tell them?
I think it's beside the point here, but if this were my project to design as an engineer, I would want to use the interior walls below for structural support (as XR250 mentioned). I would likely sister the existing truss bottom chord with dimensional lumber or LVLs and possibly also sister the top chords with similar material. I would have no clue if your modifications shown above will work, without knowing local loading conditions and existing truss geometry and material.