the screen used in this build is a 6" screen.....
https://www.alibaba.com/product-detail/ ... 05218.html
your not going to be able to fit a 7" screen into the Wii U Game Pad....
https://sudomod.com/forum/viewtopic.php ... =90#p61780
however....
its not impossible to have a build with a 7" screen....
this member managed to pull it off (and it looks pretty decent)
https://sudomod.com/forum/viewtopic.php?f=13&t=1720
Good Luck with your build....
NB: it might be a good idea to start your own post.....
.