I believe you do the headliner first and then install the walls.You can do it in just material and glue/staple to the underside of the top rails.
I want to find how a he prepped and laid the fiberglass on the roof....interesting article.....found it this is gonna be a pain in the arse.....http://www.hotrodsandhemis.com/deucegrillandheadliner.html.. Thanks ED for the posting
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