Have you done some thorough forum searches? There was a thread a month or two ago that did a similar retrofit (not that any two will be the same). The post had a lot of photos etc. of the lower carpentry aspects.
Best of luck on your project.
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J & J, DRV Suites ES-38RSSA #9679 GM Denali, 3500HD-Max, 4x CC, 8' DRW,
EZGo-TXT, Clubcar Precedent
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