Save for the engines (knowing Hemi and Nailhead are MIA) are the parts included otherwise the same as the original Revell releases for chassis, body and frames?

I'm actually good for a lot of it, including the Hemis - picked up a giant parts box from the estate of a midwest hobby rep, had most of the Sanitary T included, chassis built very well.

My goal would be to replicate the original double kits, and build with leftovers/extras.

Also: is anyone reproducing the bottoms of the Revell boxes today? I may end up making my own, that is a heckuvalotta cutting and pasting.

As always, many thanks for any help you can offer!