to start off grab a full copy of the original mochi theme
link is in this thread
I’ve hosted more themes as well, with links on wdlxtv.com
wdlxtv.com I’ve also done a full write up on how to theme, however, it’s largely out of date and mainly for older devices
but the good news theming the hub and smp are significantly easier
just unzip,
edit the xml’s or replace images
zip and done