There's nothing preventing you from TRYING to operate personal vehicles.  ...you simply automatically fail.  you still get to roll against a rating of 0 to see how many degrees of failure you suffer.<br/><br/>As for Dragonscale Armor, I'd allow you to buy it at a rarity of Very Rare, meaning that you'll have to make a Forbidden Lore (Adeptus Mechanicus) test at a -10 penalty to find the armor, which will take one week.