So...
Good news, I was able to get the head off of the Firefox cab and mount it to the I Robot Cab!
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The bad news however:
Someone must have epoxied or crazy glued the head box to the base on the firefox cabinet, because it did NOT want to come off. I ended up having to use a floor jack in order to pry it off. The base took a good chunk of the headbox with it. I was totally blindsided by this: There was no glue at all on the I Robot. Someone must have done that after the fact, I imagine. Weird. Nothing wood filler can't solve, but still, I'm disappointed in both myself... And the cabinet.
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Shit happens I guess. Hail to wood filler. Hail to bondo. Hail to the belt sander. I can see the future and it is those tools three.