Nintendo Gamecube Custom cab?

I just found out that Nintendo made a cabinet for a Gamecube Mario Kart Double Dash competition back in 2004. I want to know if anyone here can identify the cabinet as a custom build or if Nintendo just used a cab from another game manufacturer.

http://www.arcade-museum.com/game_detail.php?game_id=13527

Based on the link.. I would say another manufacturer or someone hacked up a cab they already had. It kinda looks like a zaxxon.
 
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