This Add_on is only made for mutantC_V1.
Add Arduino shield to mutantC. You can add your all Arduino Shield with your mutantC. You probably have some Ardinuo Shield that are not in use. You can re-use them now with your mutantC.
You need this parts to make one for your self (this are not affiliate links):
All the PCB and Graber files are in Gitlab and free to donload and use: