Several thoughts here in no particular order
Lock-Down : Thanks for finally adding this but please Please PLEASE - allow multiple BPOs to be locked / unlocked in one go. If anybody on the UI team wants a try run I’m happy to do some kind of screen share where they can lock down 100 BPOs using the current mechanism. We also need some fix to the number of BPOs that can be on a hangar floor, maybe exclude locked down items from the item limit? Or let me lock down cans which locks down the contents 
The industry UI in general has quirks that need fixing because of bad assumptions on scales and permissions but that’s a different subject.
Low-Power mode : You absolutely MUST code this so that the 2nd timer is skipped if there was no service module online at the time the attack started. Currently I can online modules while a structure is under attack. This presumably includes service modules. If done poorly then getting a suitable gunner to a structure means I can also activate the 2nd timer for a relatively minor expense in fuel blocks compared to running them constantly.
You can’t reasonably remove the ability to online stuff while a structure is under attack unless you overhaul who has permissions to offline modules. Currently anybody on the gunner’s list can switch things off still. Without any audit trail. You did fix the ability to rob the place blind though which is good!
Superweapons : Given the way the Industry UI already wheezes can we have a “Standup Superweapon Hardpoint” module which you load a standard supercarrier / Titan DD module in as ammo? I assume you can lock down the ability to change “ammo” while under attack somehow.
Structure Fighters : No ability to pre-build replacement fighters means there’s going to be a vulnerability window during which most structures will have no fighters. Can you please retain the ability to use normal fighters with their current stats? Even if it’s just for a month or two of transition that would be really helpful. Ideally these BPOs would’ve been seeded in advance but I appreciate that timescales are short.
Also rather than new BPOs could it be possible to just add “Standup version” to the Invention options of current T1 BPCs? Admittedly this won’t work if you are thinking of allowing T2 Standup fighters.
5 min fitting invulnerability : I’m not convinced this is a good thing. You’re making structure spamming more of a chore to defend against at the initial onlining phase. Maybe just allow you to fit modules IF the structure hasn’t come under attack yet? A vigilant hostile force can still prevent new structures going online. This helps as much with last minute stopgap defenses under siege as with offensive structure spam.
Future UI change requests : Can we have a horizontal scroll bar in the structure management window? The number of people who still aren’t aware you can see how much fuel is left because it’s WAAY off to one side is surprising. Also when sorted can “unfuelled” structures please be sorted to have infinite fuel? If I’m sorting by fuel remaining I’m generally looking for the structure with the least fuel in it to find where attention needs to be focussed.
Also can changing structure names please be permitted for Station Managers and as a remote action? It’s crazy that I can unanchor something remotely from across New Eden but can’t change the name. I’d be OK with unanchoring requiring a Director who is in the same system as the structure.