LOL! Now onto personal attacks...My cases didn't look professional, OH MY GOD! Thank you very much.
I am not here to discuss my designs, as I am still waiting to see one of yours.
Ask the hundreds of people who bought the Minimig case what they think, the continuous emails I am receiving asking to produce more.
Of course not. Your here to complain about someone elses. Being the only supplier of a product will help in getting people to ask for more, even if it is only a hobby level of quality. I don't blame them. Contrary to your claim, modifying an existing case to fit a board is a PITA. So, if someone is selling something functional you go for it.
The Minimig case is an original design, developed with engineering precision. It was meant to cover the needs of many who bought the Minimig board and didn't want it to get damaged. It wasn't meant to sell millions or take on Apple.
'engineering precision'? Sounds a little like claims of 'mil spec'. Based on the photos you have posted, you have a very loose definition of 'engineering precision'.
You are talking about a single person working in his garage, investing his own money and time VS a company with an alleged $35 million budget so I say go and get lost!
Your cases look fine for a single person working in his garage. They do not look like cases produced by a business. They don't look professional. They look like hobby cases.
I don't care what their budget is, the prototypes of the PC64 cases look very good. They look professional. They do not look like hobby projects which is what most people would get if they spent a great deal of time trying to fit a PC into an original C64 case.
You are talking out of your arsehole. If you listen carefully...you can hear it. 
I hope you can find the irony in that statement based on the first sentence of your post.
The CUSA C64 is just a C64 case with some cut outs for a DVD and the card reader. It looks very 1980s and it's not very original.
It is not just a C64 case with some cutouts for a DVD and a card reader. It is a reproduction. It certainly takes more skill to produce a good reproduction than it takes to make a plastic box with a few holes cut out of it.
Of course it looks very 1980's and it's not very original. That is the point of a 1980's reproduction. If it didn't look 1980's and was original, it would have failed in it's goal.