while your comment carerra is certainly slightly OT..i will come out and say that yes i do. And the reasoning behind it goes with the many conversations i have had not only with DA but other companies that deal with DA on a supplier and end product basis.
I made sure this was my project and my project means that i make the final decisions on the products, methods and placments for many of the items on my vehicle. Any custom car builder should be a facilitator of your dreams and while they do the actual buildup, research is the key for the buildee. Know what you are getting into before hand (there is always an air of uncertainty with projects---even ones much less complicated than these Sc'd M5s) and know where liability in a project lays.
As i just made a comment or two in another post, i wanted no one to blame about my cars performance except myself..as i had final word on what was going to be done. I know as do alot of people that build custom cars, that there are no warranties, or replacment guarantees given so it is slightly foolish to expect one to be had.