RE: Sample Projects On AX 2012 R3
Every implementation project is unique, and partners are using their own practices and implementation methodologies to deliver a project. There are no implementation samples provided, the only possible way to acquire this knowledge if you get affiliated with a successful partner and learn the nooks and crannies there first-handed on a new project.
As a framework you have the Microsoft SureStep methodology that is a generic project delivery tool with some typical document samples, you could have a look.
Larger projects are typically using Agile code releases with a Prince2 project delivery methodology (or their own version of that).
You may find books as well about how you should conduct an implementation for AX.
https://www.google.hu/search?q=ax+implementation&dcr=0&source=lnms&tbm=bks&biw=1920&bih=947
There are printable guides on the official documentation site too:
[View:https://technet.microsoft.com/en-us/library/gg732268.aspx:750:50]