Double kart my beloved. I think all of these is useful for some users out there, even myself! But there's some issues with the Symmetrical Normal Double Kart template, most notably the death sprites. The Asymmetrical one doesn't have that Death Sprite problem, So it just a mistake. Also the #2#8 (Symmetrical) or/and #2 & #8 doesn't have tire shading in the platform on the back of the kart (On any Normal Double Kart Template). Other than that, great job!
