I've already rationalised the power windows down to a single fused 12v cable only into each door with a dual relay setup inside each door to work with the factory switch. (For some very strange reason the power window wiring in my car was 'aftermarket' - I have an unusual mk1a aus delivered car so maybe it wasn't aftermarket at all but cut and shut manual to power conversion from the factory.)
Anyway, I'll leave the power windows for now and keep a lookout for manual ones from AW10 and early AW11s incase something pops up. Also, I have a stripped spare door, so can take photos/parts with me to the local BNE pick'a'part wreckers until I find something that may suit.
There is sooo much other 'quick win' weight reductions to do to the car first - HVAC delete, sound deadening removal & aluminium/plastic engine cover - to name a few. The combined weight of my new side mirrors, front headlight assemblies/brackets & front and rear bumper reo bars would be under 10kgs lol.