It doesn't really matter if its Aluminum or Steel, its a design. It's not real and he's not going to be able to build it. It would take a completely different set of skills to fabricate the case the whats needed to design it. Getting someone to do the fab work for one of the design would be cost prohibitive because it would require all the work to be done by hand. At the prevailing wage for such work your looking at around $1000 for the case based on getting the job done in ten hours and I really don't think it could be done in 10. To mass produce it would require millions and then you also run into copyright infringment problems. Silverstone claiming it looks to much like one of their cases, Lian Li claiming the hard drive cage is theirs.