An update:
Well, it's been almost a year now and we are almost finished with the final art for the cards and board.
we're both have a day job so it took some time. when we'll finish I'll be glad to send a test packet to those who are interested in trying the game and get your feedback.
We decided not to use the Nedor characters, only characters from Fox, Centaur, Lev, Prize, Hillman, Holyoke and Ace.
We wanted to use some of Novelty characters (Blue Bolt, Spacehawk, Whitestreak and Sub-Zero) but were not sure of their status. In a quick search we found that Novelty Press sold its assets, including Blue Bolt, to series cover artist L. B. Cole (wiki - not the best source of reliable information we know) and that it's possible that Spacehawk creator, Basil Wolverton, might had some rights to the character or others now have them after his passing.
We don't live in the united states so we can't just look in the library of congers for renewals
We know there was a new collection of all spacehawk stories a few years back and we could find
We looked at Dynamite, Image and AC comics to see if they used the Novelty characters but found that they didn't.
If anyone have different information it will be most appreciative
Thanks for your help