Cool shot, thanks.
Is is possible to damage a capital ship with the stuff we can buy?
Yep, pop the heat relays, but they got a LOT of armor a while back. One C2 Multicannon is not going to cut it unless you want a long fight - you need C3 cannons for a proper attack.
Also, Phra Mool has a CZ with both battlecruisers broadsiding each other.