I never listened to the old Captain Midnight radio shows, but I did watch some of the old serials. I opted to try and mix the fight suit of his origins with the more superhero-esque costume that he eventually came to wear in the comics to come up with a happy medium that pays homage to both.
The original art for this one is available for sale. 8.5x11," ink on 80# stock, shipped the Tuesday after purchase. First come, first serve.