...yes if you give me a 3D printer capable of printing something as wide as an A1200 I will hand you a case in 24 hours....the 0ther 24 hours is to print the custom lids for a 64C and A1200 
If a person has a 3D printer they can basically "make" anything. Yes, one has to draft the design, but so did Ben Heck.
The difference is that after drafting, Ben then proceeded to make all this with his own hands (yes, I know the parts were roughed out on a milling machine).
I wouldn't dare draw comparisons between, for instance, a skilled woodworker or jeweller and someone who prints out a replica of the wooden sculpture or jewellery on a 3D printer.
So, as for Ben's C64 laptop, I'm impressed.