The commander ability "Ambush Gunner" seems over powered. Saying your attacks "cannot be obstructed" seems to cancel the effect of "Early Warning System", and other upgrade cards that "obsruct" attacks. The General Romodi card has a similar effect, but excludes card effects.
I think, at least, the "cannot be obstructed" effect should refer to obstacles only. I would go so far as to the specific obstacles that you are at distance 1-2 off, that at least makes thematic sense.
Then, if your target it using EWS (or similar), you should still be obstructed.