uhm.. so basically a Rogue trader then? [img]http://i6.ifrm.com/html/emoticons/biggrin.gif' border='0' style='vertical-align:middle' alt='biggrin.gif' />
unless... if you go for a vostroyian first born imperial guardsman, in which case the steampunk look is very prevalant.
a Rogue trader is not a soldier though, (pirates arent either btw) but they often have very ship like fashion styles, and a steampunk sort of flair to them (with added skulls and such, like any good member of the imperium) you should look up on them..
an imperial guardsman and a pirate are a bad mix, but an imperial citizen with a pirate flair would certainly be a rogue trader.