Dont look to me like the "inner wings" need anything doing ... I mean usually they go along the joinbetween bonnet hinge area and where the suspension turret joins wing, you know along that seam, they crack... I would have it seam welded down there at the very least, this can be done from under the arches, or within the bay..

whats the battery tray/bulkheaad like if you look up at them from inside the car?

I'm of the firm opinion as little panel replacement should be done as possible, welding creates heat... heat accelerates corrosion... either way, you can replace numerous panels etc and still have rust creep back a t a later date, all you can try to do is slow the process down... ok the floor is a bit tatty, but again I wouldnt want complete sections put in, unless the inner sills are £cuked also...

Be nice to see the front crossmember from below and with the front kit off... but I wouldnt £cuk about replacing that based upon what I can see there... so long as they spend a good bit of time cleaning it all up properly the paint will stick nicely , then give it all penty if waxoil (especially seeing as you aint gooing all bufty).... should be good for another few years