Charlie, this might be a good money raiser. Many of us, myself included, don't need or want new cars, but will buy a well-messaged T-shirt in a New York Second. Face it, we all need to cover our upper bodies....some more than others. (New York Second = minuscule period of time between the light turning green and the cabbie behind you honking his horn.)
I agree with Jerry. Use Roger's original as modified by Charlie, silk-screened onto the front of a t-shirt with the shirt's color replacing the white in the design. Now the $64,000 question for the basic t-shirt...what is the color of model railroading? I'm sure we'll receive as many opinions as we have members.... BTW, I'll take an XL if it doesn't go over $14.99.
However, I just looked at hundreds of similar messages and I really don;t think there will be a problem.