For unknown reasons, the cutaway view clearly depicts a single-seat aircraft (which you can also see in the image at the top of this thread, I just hadn't noticed it before buying).
Now I guess I can look forward to this exchange with friends and family whenever I wear my shirt:
They: "Hey, is that the plane you're building?"
Me: "Sure is!"
They: "How come you're not building one that you can give us rides in?"
Bought my RV14 shirt at oshkosh. Wore it once and its falling apart! Holes have appeared all over it. Not sure what caused it, its not like I spilled battery acid on it. I'm praying my Actual RV14 holds up better.