And please add the one where there isn't a space between bottom and top screens in the preview! Where the top screen starts at 0x0, not sure about the bottom one.This is the best fit for your app cause you get the full preview for both screens without the need of scrolling. Also theres no need to rezise the screenshots taken via NTR or the bulit in feature the 3ds haves.
I'm not sure if I got right second part
Up Screen: start 18x13
Bottom Screen: start 58x272