This looks almost correct. However, I'm almost certain a scroll of permanency must include as part of its creation (therefore adding to its price) expending material components equal to at least the amount it'd cost to have the the spell permanency affect whatever spell will be affected. In addition, the GM may require each scroll of permanency to specify the spell that permanency spell will make permanent.

Option 1: Use scrolls

• arcane scroll of invisibility (2nd-level spell at caster level 3) (150 gp; 0 lbs.).
• arcane scroll of permanency (5th-level spell at caster level 10) (6,250 gp; 0 lbs.)

Option 2: Use services

• 1 casting of the 2nd-level spell invisibility by a level 3 caster (60 gp).
• 1 casting of the 5th-level spell permanency on the spell invisibility by a level 10 caster plus material components (5,450 gp).

Option 3: Do it yourself

• 1 casting of the 2nd-level spell invisibility at any caster level up to your own.
• 1 casting of the 5th-level spell permanency on the spell invisibility at any caster level that's at least 10
• Material components costing 5,000 gp for the spell permanency on the spell invisibility.

Option 1 costs a total of 6,400 gp. Option 2 ideally costs 5,510 gp. (I say ideally because were I a wizard who loves money I wouldn't cast permanency on some low-level punk wizard's invisibility spell; I'd make you pay for one of my far better solid, robust, dependable, level 10 invisibility spells. You don't want to skimp, do you? This will be permanent, after all.) (Tip: In the world of Pathfinder durations, permanent only means permanent until dispelled.) Option 3 costs only 5,000 gp, but you've to be an appropriate level 10 caster (necessary, in all cases, because of the minimum level needed to affect an invisibility spell with a permanency spell).

Almost definitely nothing.

The rest variant you have described, where a short rest is 8 hours and a long rest is 1 week, is exactly as described in in the Dungeon Master's Guide on page 267 in a section on Rest Variants.

The designers suggest this option for "gritty realism" and do not provide any warnings about what this might break or imbalance, and their silence suggests that nothing unexpected* should happen if you implement this rest variant. In other words, it should be safe to utilize this variant without anticipating the need to fix anything else and without endangering the integrity of your campaign as long as you plan for adequate opportunities to rest and avoid overloading the players with a combat pacing that presumes the standard rest schedule.

(* By "nothing unexpected," I mean that obviously your characters will be more hard-pressed with their resources, but that is an expected consequence of this variant. You shouldn't see any game-breaking side effects, however.)