The original image was a monochrome hand-drawn sketch. Your version doesn't necessarily have to be in that style (though it could be). What is important is that the dreamy, adventurous, somewhat vintage spirit is maintained, and that the result looks great on a wall and is recognizable. Many of the details in the original drawing were, even at the time, a little ridiculous—for instance, there are strip charts and knife switches being used on a flying lab, and there is exhaust coming from the back of a vehicle in space. All of the instruments and readouts need to be updated with more modern variants.
Bonus points for adding touches which pay tribute to other books in the second series by Victor Appleton II (Tom Swift Jr.). You can find the list of books at http://www.tomswift.info/homepage/ . For instance, little display models of other vehicles can be placed on shelves or mounted on the walls or ceiling.
If you have a style you'd like to use, you can show me another artwork that you think shows that and ask if I like it. Use a style you love, and maybe I will, too. Especially if it has a vintage, nostalgic feel to it. The only things I definitely would NOT like is a cartoon-like or too modern or clip-arty look.
Final print will be a wall poster, probably 24" wide by 18" high (600mm x 450mm).