Magic items in Spelljammer...

In the fantasy tradition a great portion of the skill required to make
a magical item is in the fashioning of it.
In AD&D the mage can enchant items crafted for him on commission or what
have you, provided the item is of sufficient quality.

In Spelljamming terms, how much of the magic of the ships are in their
construction and design and how much in the spells imbued into their
fabric?  Can an experienced, 0 level, mundane craftsman do much to
create such an item?  Can the level of crafts skill required to build
a good ship be rare enough that a good portion of a ship's cost is to their
skill rather than the mage's skill?

Given the Psionic Science, Molecular Rearrangement, the manufacture of
consistently superior blades it possible, and probably other items as well.

If magic and psionics can craft the items to be enchanted, who supports the
high end skilled craftsman?  They just are in the competition with magic
items around, and who would pay so much extra for 'the best mundane sword'
when the worst magical sword is better?


I often encounter justification for why a particular magical spell or item
doesn't change society is that there are countermeasures.  What are these
countermeasures?  A low level scry and teleport guard, or a high level
permanent one wouldn't help stop them from being used for trade and
communications unless they had serious range, where a single mage could
screw up communications and teleports over a continent.  Such spells
are a staple of fantasy  books.

Just a few questions:
How much do the following 'permanent magic items' cost in yours campaigns?
Continual Light lamps, (Is the spell enhanced by being cast into a specially
crafted lantern?)
Magic Mouth alarm stones
Sepia Snake Scrolls, (Being in stasis is much better than being dead)
The cleric spells: Frisky Chests
Glyph of Warding (on carpets or other movable ward objects)
Fire Trap (At 2nd level this is a potent trap!)

Armor is another spell that can last for a long time, and so can be purchased
in a highly civilized area and last a long time if the wearer is careful.

What other spells and spell combinations can be useful if they last a long
time?
(The frisky chest spell is an amusing one to cast on a heavy wagon, you can
'herd' the chest or heavy item to market, not worrying about the condition of
the roads...)

more later...
Michael Sandy