Hey.  I'm running Spelljammer and want to make some modifications to the ship NPC sheets but can't figure it out.  Can I add fields and submenus or anything else somehow?  For instance, under "Cost" I wanted to add an entry for "Maneuverability Class", and below weapons I want to add a header for "Upgrades."  And other things.  I'm not sure if I can customize the sheet.  I tried fiddling around with the Attributes/Abilities tab but I couldn't see any changes.