If you want to be a nickpicker, the proper calling is determined by who is drawing them. If someone's job is to make computerized modeling, then the above CAD (don't confuse it to the official term of Computerized Automated Drawing, eg. AutoCad) and CAE terms are in place. But if its done by someone in mere hobby base, then the proper term would be fanart (regardless if the drawings are technically CAD/CAE) to clearly demostrate that they are nothnig more than some individual's own suggestions.