i have spoke with Brian as mentioned in an above post, regarding the use of only "UTGF" and there's no problem there.
The big things to watch-as any other brand of products(Martin, Harley D, Ford, Chevy, Smith & Wesson, etc)is no infringement on product/design. in this instance that would mean no use of the Taylor headstock shape, pickguard shape, and the name itself.
in hind sight i think i put the cart before the horse. i think we actually need a "banner" designed first, and then in time one could revisit the T-shirt manufacture, using that banner design.
d