Bodywork - Ali or GRP?

[acra]

Hi guys, yet another of my prospective ideas gathering threads for my future build...

I'm just wondering whether to go for a GRP full bodywork (side panels, rear and bonnet etc) or Aluminium for those bits?

Realistically I would struggle to fabricate Aluminium myself, so whichever I went for I'd be outsourcing them - so my main two factors are weight and cost (in that order!).

I've been eyeing up the Saturn kit, but am definitely in the mindset of fitting a full windscreen.

Any advice would be awesome!

(Side note, my copy of 'the bible' should be on order shortly - There's some nice prices on tinternet at the mo...)