Voidjamming

I use an idea from Dragon #159, voidjamming, but I've updated it for
Spelljamming and Planescape.  Metal on the Astral plane becomes imbued
with psionic energy.  This metal is mined and worked into wire which is
laced througout a ship.  The pilot on a voidjamming ship is a
psionicist  who must be a telekinetic or psychoportationist.  To enter
Astral Space (an equivalent of hyperspace in my campaign), the ship must
reach SJ speed, then open a portal to the plane (with spell or magic
device).  To reenter the prime, a carefullly updated map of color pools
must be kept.
The booklet Astral Space and the Article Voidjammer's in Dragon #159 are
invaluable to use Astral space as a form of hyperspace.  (this is
important I discovered to keep your heroes from dying of old age in
between adventures especially for those campaigns that don't take place
in a single sphere.)

I also have two planars on my crew including a tiefling.  We also have
a  fallen Angel as a villain, and went plane hopping when Loki attempted
to start Ragnarok early....

The two settings mesh very well, and i would like to see TSR redo
Spelljammer, and give it an attitude a la Planescape.