This work looks amazing, I really do wish I could do this sort of thing.
I know what you are going through with being stiffed by a client, as a computer and network technician I have had a customer or two that I had done big jobs for that ignored the invoices I sent and refused to pay even though the work was done right and they were satisfied. It really is a shame when it happens, and who really knows what we can do about it except hope others back us up right?