Fused Composite Platings are *significantly* more massive than the sum of the masses of their component parts.

outer hull plates 20x550kg = 11000kg
heliocene 3x100kg = 300kg
pentric 2x150kg = 300kg
silksteel 8x90kg = 720kg
XiRite Alloy 15x300kg = 4500kg
Synth Hydrocarbons 15x90kg = 1350kg
Plasteel 5x80kg = 400kg
Synth Silksteel 10x80kg = 800kg

Total ------------- 19370kg

Fused Composite Plating = 90000kg (PRICELESS!)

For everything else, There's VerasiCard.

The better to run yer arse down and pirate yer cargoes.