Thanks Dread, paint hasn't realy been flying lately due to the weather and videogames, but I'm sure I'll get back into the swing of things soon enough. If I had went with a custom craftworld I would still be painting guardians in test schemes.. it takes me forever to come up with something I like. I might design a craftworld for these guys at some point (mainly because I don't like the Iybreasil rune all that much) but I quite like to colours. It's going to be a bit of challenge to tie in some of the aspects in with the rest of the army, but I'll work that out when I get there.
@mage: I'm using diametrically polarized(?) magnets and they do a good job keeping the guns from drooping, but there is a bit of room around the magnet and the original mounting point:
This causes it to sit a little crooked unless you mush the magnets, on the turret and gunshield, into the slot. It can be done, but than I risk breaking the magnets of when swithing weapons. A tiny bit of putty should allow the magnets to sit flush whilst still having enough 'pull' to keep everything in place. I ordered some thicker (3mm as opposed to the 2mm I'm using now) magnets for future vehicles, and those will fill up more of the hole and (hopefully) eliminate the problem.