How to set upper bunk in fixed top?

[gianttree01]

Hi , there
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I have a 2001 smb with the explorer bubble top and the eb50 setup. There are cabinets around the rear and sides and I want to add an upper bunk over the lower sofa bed. It looks like I could just add 6’ strips of angle iron on the lower edge of the cabinet frames to support a bed platform but I’m not sure what the horizontal material is just below the cabinets. It’s covered with their plush fabric but I can’t tell if it’s 3/4” plywood or mdf like the cabinets. Obviously I wouldn’t hang a bed from mdf but I was hoping it was plywood. Anyone know what they used to build the sides where the roof was cut out?

Thanks

[gahamby]

Have you contacted Sportsmobile about this?

[Grampswrx]

I would love to imagine that it is plywood. However, I have never found any plywood in any SMB I have owned aside from the upper bunk.