@Gregster: Use multi-docking + some SEXPs??? Nice idea.
(I once thought of an advanced version of the Mara that could separate some of it's spikes like that and use them as drones, but it'd loose some maneuverability/speed without them)
Personally, I too think there are two kinds of Shivan designs, though both of them seem to share the "insect"-look - Scorpion and Lucy included. The Dragon looks nearly Terran, I'd say though.
I much prefer the "evil high-tech"-look from FS1 (Basilisk, Lilith, Lucy, Dragon, Nephilim and some others).
And if you like the Lucy, try LS' "green Lucifer"-glowmaps - they're absolutely stunning!

( <- this is supposed to be a happy Shivan...

)
And speaking of creating ships based off the Lilith/Cain - I have one WIP of a fighter somewhere... sadly my mods are only evolving very slowly.
Just a few days ago I started working again on a Shivan bomber model which I could'nt make heads or tails of for a while (started it somewhere in late 2001 or early 2002 I think... and it went comatous some months after

).