Hi Christian,
This looks challenging, fortunately i love a challenge. I have visited the website and seen the concept of what you are trying to achieve. I am not sure however what exactly you are seeking help with. There are a lot of components in that system. the CAD, the spot welder, any interface you are expecting between the two is not clear.
Can you expand a little on your requirements and I will be happy to look at it in more detail and give you an idea of costs and timescales.
I have sent you a PM with my skillset outlined.
Cheers Pete.