Have we forgotten John Zabolitzky's MUNIAC? While I do not think he has
completed it yet... nonetheless parts of it function and have been
displayed at various VCFs... it is constructed on standardized Eurocards,
which are them populated with the correct components to realize a
particular function - gates, flip-flops, buffers, etc.
Hans Franke might know if any documentation for this is available
someplace...
And no one has had the utter madness to suggest a replica of the Mark I
or II relay machine..... or the SSEC.... or any of the Bell System relay
computers....
Then of course - there's Stonehenge.
Cheers
John