So the bottom of the cab had severe damage. The is a channel the MDF bottom panel rests in. It appears the bottom left corner was pushed up and the bottom trim holding the bottom panel was busted out 3/4"s of the way down on the left side, all of the front and a small portion on the right. The fix was drywall screws. The worst part was the glued it back as well and didn't do it flush so the bottom trim isn't going to be flush. I tried breaking it free but the pressed board MDF just disintegrated so I with have to live with the slight imperfection. I plan on sanding and filling it to minimize the appearance and paint all the way around the lip up to the bottom panel. That should hide most of the surface irregularities.
Before:
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After, with brads holding it in place.
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And final with wood glue and clamps:
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In this picture you can also see my test sanding area at the bottom by the speaker cut outs. I originally wanted to replace the bottom but it just wasn't feasible. In the end, sanding worked great at getting 30+ years of grime out. I lose the pebble texture but visually, a clean bottom is better to me than staying true to the original.
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No I wait for the glue to dry so I can replace the interior blocks that are damaged.