What I'm getting at is even though the hair is shorter it should be more spiked out just shorter then the above image. I even have to say the USSJ Trunks used in ESF looks just like SSJ Trunks with the arms of his shirt ripped which doesn't seem to fit USSJ category if you ask me.
Good point. I'm still yet to see an average looking "USS" model. Most of them look completely out of proportion. I noticed a similar problem in the Budokai games. The ESF 1.3 USS Trunks is decent although I am in agreeance with what you said regarding the form. If the team plans to make an USS Vegeta I'd suggest using the same method done with Trunks. That is if you guys plan on redoing USS Trunks.
One thing Phobius: The ESF 1.3 Trunks (normal) is the short haired version. Meaning if he actually went USS in the series it'd look something like the 1.3 USS Trunks. You actually see Trunks w/ short hair go USS during episode "Free the Future", where he kills the Androids & Cell, and his hair didn't get as long as it did during the Cell Saga. So, to some it up, Trunks' hair only got that long and spikey when his hair was long in his normal form.
I'm only pointing this out because I have a feeling if the team does happen to make USS Vegeta they'll make him only look slightly different than the 1.3 SS Vegeta; sort of how the Trunks currently looks--if the USS is considered then I think an entirely different model should be considered, too.
Just to show you the major differences between SS and USS. Same should be applied to Trunks:
There are VERY obvious differences--I'd hate to go "USS" in ESF and only notice two or three more spikes on my character's head and a bundle of chunky fat muscle rolls.
I also still think SS2 & Majin Vegeta isn't an entirely bad idea.