No problem. 'Parts' in Shipbucket include such things as guns,missiles, cranes, lifeboats etc. and we don't credit for them: they are on the parts sheets and if not folk accept that they are common property. Basically, you'll need to click onto the guidelines and anything to do with the rules and regulations; maybe using a translator function, but better, having a friend from our Spanish speaking comrades who can give you support.
With the credits, when you take sections from existing drawings you must give that members name first, then yours after; and again, just look at the archive and existing projects to see how members follow this rule