Seriously, if you can't tell the difference between a X wing and a Z95 you should get your eyes checked... There are more differences than similarities. The guns are different... The back area behind the cockpit. .. The closed wings on the X wing would be thicker... and I believe the X wing is longer...
Certain mods can change up the look of the ships, my Solar Flare YT is one of those, overall it will still have that YT feel to it, but it will be heavily moded. I could see someone being concerned with it though, and I would bring a unmoded ship just in case.
Personally I hope the TO is as big a fan of, not only the game, but Star Wars as I am and would allow remodeled ships in the tourney.
I think though, the smart gamer brings what he needs for the game, and what he needs to replace just in case there is a problem.. I think that comes under the 'fly casual' concept..