http://5dfcmsgsfemr4n4oea7nryhfc67xcnf7bk6wjvw7q2h4zmcakspby2id.onion/methos-creation.html
Mainly because it's tedious and takes a long time, but also because most people I've spoken to have a very hard time visualizing something in their heads. Unless you're a 3D artist, visualizing something perfectly in your head is going to take time. And visualizing perfectly (or as close to perfectly as you can get) takes time, as you may have expected.