Are there generic/sterlie Grandfather Tuna Professional 600m cases?

[RickFlorida]

Hi everyone,

I'm really enjoying how easy it is to mod watches with NH35.   I was curious if now that the old vintage Seiko granfather tuna (I think it's the 600m Professional models like from 1975) are so valuable and sought after, is there a demand now for sterile/generic cases of high quality that have the same dimensions and functions for building with NH35 or other?   I know there are some generic Seiko tuna like cases on Aliexpress but I'm talking about a solid case that doesnt' open in the back and has the same shroud dimensions, etc.  Like these photos. 

[RickFlorida]

The 600m professional Seiko divers are like 5,000 dollars so I'm surprised there is no high end clone cases for them. Same for Omega Ploprof. 

 

Why is no one making high end Ploprof cases or 600m grandfather tuna cases?   I would love a generic/sterile one with same outside dimensions/function.