In the last couple of years I have been paying attention again and learned a lot. Several helpful members have lighted the way on most of these points. I am very grateful! Some are old news to many if not most, but all were news to me. There are other fascinating details about this model, but I knew of them last century

Here goes:
Battery cover is similar to later hard plastic cover, but made of fiberboard.
Headlight lenses have no script horizontally close to the bottom. All script follows the curve of lense bottom.
Moll 6-volt batteries sold by Porsche for our cars are incorrect. Should be 84 ah, not 77. Moll does make the right specification, so it is a mystery why Porsche doesn't import the correct battery.
Most say tool kit bag is made of light grey vinyl. Others say blue vinyl from T-5 is (also?) correct.
Front torsion bars are 15 mm. Good idea to switch to C 16 mm bar or Willhoit's 17.5 mm.
Porsche sells new original Fuchs brake drums, front and rear, but they aren't cheap. Over $2,000 list price.
Porsche just recently talked Pirelli into making CN36 tires in our size of 165-80.
Fuse box has two posts and a corresponding cover with clips to mate. Early model year 1962 only.
Porsche did supply a VDM slotted-spoke dished wood wheel, but it only works with the deluxe horn ring.
There are locksmiths who can make keys for transmission locks (which don't have a working key) without damaging (cutting open) the lock. Also can determine FE code just by measuring the profile of a working key.
S90 camber compensators are held in low regard.
Lifting hooks showed up on C engines.
Original Hella 128 lenses are subtly different than current reproductions (which are not made by Hella).
Bodies at the rear are tighter on the right (seemingly without exception).
Roadsters came with vinyl interiors.
Some of these observations were surprising even to experienced 356'ers. Others are old hat. I welcome emendations.