As for the railgun sideys' - a bit spicy for a joust, don't you think? One good shot on the powerplant and it's fried Baron noodles. I was thinking more along the lines of gentlemanly lasers and multicannons. We can save railguns for duels when honour depends.
In an affair of honor, the weapons would be negotiated between the combatants' Seconds, with the proviso that if there is disagreement, the recipient of the challenge's preferences hold. (i.e.: if you challenge me, I have the right to pick sidewinders and frag cannons and if you don't like it, you shouldn't have challenged me)