This thread has my Cletrtac build in it, among other things. Mine is not nearly involved as yours. In the thread I explain I want to pay homage to Shep Paine by using as much of the base kit as possible. Yours on the other hand is an absolute masterpiece.
My second Cletrac is in red and yellow plastic, kindly sent to me by Fred Boucher. Apparently is was from a Monogram missile kit. It will feature the engine from the Atlantis Fuel Truck kit. Flat head six, just like the Cletrac, but won’t be exposed like yours, so possibly a tad less detailed. 
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