Let's look at the details of the TOP and SIDE views, while comparing them to the finished product. It took more than one viewing for for me to notice the changes between the concept sketch and the final TBX, (and like a "Where's Waldo", there may be additional details to discover).

The TOP VIEW is very much like the final TBX with the exception of the "side air inlet scoops", which have been erased, but you can still see the outline of them. It looks like Tom originally intended the TBX to look even MORE like a jet aircraft than the final version does. By this time Ralph Brook's "CRUSADER" had been published. Perhaps that model was at least a partial inspiration for the TBX-1.