I bought and built another S800 to implement some of the mods I wanted to do Didn't want to take apart the first one since it's flying so well.
I documented these mods and some build tips here:
https://oscarliang.com/s800-fpv-wing-upg...ps-tricks/
It's been a lot of fun and I learnt so much from building these two wings, now the next step is to do iNav on one of them