Gunradd, at the moment I have the cg 3 inches aft if the main spar, I could go back perhaps another 3/4-1 inch max but any further would make it so light on its nose gear I'm not sure it would be wise , however no experience of a lightning means possibly this is what it needs... time will tell it's a murderously difficult job shoehorning all the electrics in this one, I'm just about winning at the moment, I've made a removeble tray that slides up the spine via the top hatch, it sits about 5 inches above the bottom engine( have staggered the engines as per the real thing.. ) and extends about 3 inches forward if the forward spar so helps keep weight forward, I think I'll need a little nose weight but not much.
thanks for the encouraging words