I have never seen a kit based upon this, but I did know some of the FASA developers and you may be surprised to learn that the engines were configured in some images were upside down due to an editing error, depending upon from which book you got the diagram!!!
You may be able to Kit-bash it from several kits (galaxy, NCC-1701-A, & excelsior).
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"One does not plow a field by turning it over in his mind..."
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