a "plasma torch" is capable of blasting ordinary matter into electron soup.
an antimatter explosion would create higher energy densities that that.
What i would guess is GTDs have some special hull coating at one layer that absorbs energy.
Ablative armour, while a reasonable supposition, wouldnt help much.
Also remember that there are compounds and arrangements of existing elements that would be far far far stronger than anything we have today. (buckminsterfullerine, carbon nanotubes anyone?)
Ive got a couple of other ideas but im keeping them up my sleeve for a while.
Oh..and the dual athlon runs very nice, thankyou

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I'm sick and tired of being sick and tired!!