Per the tournament rules, yeah. But when I was at a tournament run by FFG I don't think they would have DQ'd anyone for so slight a mod.
Right, but if an opponent or TO were to disqualify someone for a modification like this it would be out of pure spite.
The modding rules have two possible motivations: (1) To not confuse players (e.g. making "uglies" with an X-Wing body and Y-Wing engines and then using it as either an X-Wing or Y-Wing, which could confuse opposing players) AND (2) to protect FFG's financial interest (e.g. not using micromachines or cutting up a TIE fighter to make two TIE fighters).
This sort of mod doesn't violate (2) since all the official parts of the FFG models are present. And it doesn't violate (1) since it actually HELPS clarify who's who and who's armed with what. If I'm playing against two identical-looking Firesprays, it's much tougher to assess who's Krassis and who's Fett and who has what upgrades. Sage's Firesprays actually make it easier--I can see who's who and I have visual cues as to who has which upgrades.
Similarly, playing against a stock dual Falcon build is really annoying because the ships look the same and the model is so big it's hard to see the base to see who's who. I much prefer to play against opponents who use a stock model as one pilot (with the title) and a model they've either painted and/or modded as the non-Falcon other pilot.
Technically a TO could declare a violation here, but all Sage would need to do is simply pop off the accessories and glue them back on later if it was really necessary.