depends what you intend doing with the Zed
Hillclimbing/sprinting/trackdays (probably in that order too)
Don't know what the regs are nowadays but when I used to hillclimb a looooooooooooong time ago, stripping out seats etc etc put you in a different and far more competitive class, i stayed in the road modified class and still had great fun
That is still the case today. A stripped-out Zed would be in the same class as say a modded Noble of Evo chucking out any thing from 400 bhp upwards, running slicks and considerably lighter to boot.