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Here's a marker rendition of a design for an updated FIREFLY, I'm guessing it's from Mike's tenure on the Universal Thunderbirds movie, but it's marked 2002. Mike sent me a disc full of images without captions, so I'm not sure exactly where this is from. It certainly fits in with the design aesthetic of the feature film.
There are several other updated TB2 container vehicle images on the discs, I'll try and get some details on them and post the images soon.