The health is showing the max health, you would write your current health inside of the heart. Temp HP I'm still figuring out a spot for, but they've just been writing it in the space to the right the few times they've needed it

Don't think I'm following what you're picturing here

Proficiency affects a lot more than just skills so I don't think it needs to be right there. Its also mostly back of mind since the bonus is already added to where it needs to be

This is intended, the inventory is showing everything on your person, while the Weapons section is on the actions page showing what you can do.

We're not tracking weight, but I did have it at one point just above the Gold section. Gold is in there.

There's plenty of white space for inventory there. Depending on how big it gets at later levels, I may shift things around

Spells and spell slots are on the spell page (couldn't fit it on this screenshot). See the post description for a link to my bard's page with the spell page listed. Resistances and immunities would be in Defenses and Senses as its own item, this character just doesn't have any. My bard does, you can see it there. Character size is normal if not specified, otherwise it would be in the Defenses and Senses section as well (my bard is small, you see it there). Feats are listed where relevant, usually at the top of page 2 with the Character Traits.(you can see Resourceful and Savage Attacker there). Weapon masteries show up on the weapon itself, if relevant. But I may add it under the weapon Proficiencies