Alfresco provides an interactive tool to design your own custom model. It allows you to add custom types, aspects, and properties. On top of that, you can use the same tool to design the different forms for your content types and aspects. Open Alfresco Share and login as administrator, click on Admin Tools, click on Model Manager.
We are not going to discover how to use this tool but you'll notice that it follows exactly what we did to create our custom model manually. You could argue that it would have been easier to use this tool, instead of creating all these XML and properties file. However, I think that it's always important to really understand how it's configured and implemented from a pure technical point of view. Moreover, this tool doesn't cover all possibilities. For example, it's not possible to create association or child-association using this tool.
I would recommend this tool if you are looking for implementing a quick demonstration. But I don't think that it...