If it were me, I'd store the original stuff & do any/all mods in a way that it could be put back to original at a future date for a future owner - or you. As with classic cars, vintage trailers & AS's, there is a value to originality to the collector world. Storage in most Irvine projects is probably an issue, so you'd be using a storage facility for the trailer in all probability, so you can just rent enough space or a locker/space for the parts.
Also, kids grow & your needs may change in the future where you'll downsize to a shorter AS, so the parts may be helpful is resale at a later date, or for you're putting it back to original for just you & your spouse (as empty-nester vintage kin owners, we'd make different decisions when kids were young, than now - even with the grandkid(s) in the equation). A 30-footer is a lot of trailer to haul around, & will preclude you from some locations (Sequoyah National Park & PCH north of SF come to mind) - so you may want more flexibility in the future with the shorter trailer.
When you're ready with that `68, you may want to look into going to some vintage trailer rallies - so get onto Vintage Camper Trailers magazine's website & look up the upcoming events, & a subscription will be a helpful tool as well.
They're loads of fun for folks of all ages, & kids too! Newport Dunes is close by this October, if you want to check one close by at the public open house show-n-tell of all the trailers, plus some are selling parts there which you may need. There'll be free hotdogs for all comers by one of our vintage AS buddies, so feeding the kids is fun-n-free! Look us up if you come to it.
Also, Vintage Trailer Supply is your friend when restoring/updating vintage trailers (separate companies, but latter has ads on here).
FYI - there was another member on here from San Diego also getting a 70's 30' AS, so you'll have company here in SoCal.
Good Luck with the resto-mod & hope to see y'all at some vintage trailer rallies in the near future!
PS - you probably visited the OC AS dealer up in HB/Westminister (by Lexus off 405 at Beach), & despite what they tell folks, be assured that there's nothing a new AS has that you can't recreate in your vintage AS (TV/Audio, Microwave, etc. ...) - except that the new ones are not built as well as the vintage ones & are much heavier in their construction!
Cheers from your vintage kin Avion buddies up in Orange!
Tom (& Jana)
Avion T20 #2