Good ol' McMaster-Carr and their next day delivery. Bottom box panels all installed. It needed 1/4" spacer rails to clear the metal pans under the seats with a little extra space but it's still tucked up pretty tight. You probably won't even see them when the body is on.

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Looks like the 80/20 rails will be here Saturday so I should be able to get the three boxes all assembled this weekend. There are three pieces on the front box that will need TIG welding so once the front box is together and I decide on the final front to back placement, I'll take it back over to the chassis shop for them to weld.