It's a long time since I had a Gem, but I don't remember any LE mods.
Main ones were:
Changing the cross over bridle ( on the original version) to the Cross active bridle (standard on later versions)
Pulling in the trickline for better turtle based tricks - pull in to 6cm - you need a longer trick line or fit elastic in the middle like the Outerspace.
2 X 8gram weights on the standoffs for pitch tricks.
some folks also retro fitted roll bars.
somewhere on the web there is a German article called 'Pimp my Gem' ( or something like that) with some good information.
Also check this http://www.bensontwins.nl/kites.html