Well, the simple answer is there is no framing in the roof except the outer edges of the roof panel. On some years there was a frame inside the roof cutouts for the vents and A/C but not all years had that. The roof is 1” thick.
As for how the cabinet is installed, if it ever stops raining I’ll pop open a TM and try to get a look.
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2007/21 TM 3326 (Pride of the Fleet)
2000 2720SL (Rebuild Project)
2002 2619 (Parts TM)
SMARTER THAN GOOGLE!
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