Actually all of the above about Goodmark is a bit off base, keep in mind that Harms will soon be a Goodmark/Shermans dealer so knocking thier products is the furthest thing from my mind. That being said.......
No, they do not have plans to make a Challenger Shaker Hood.
However, they are currently developing a Cuda version, don't look to see one anytime soon, other projects (the long awaited Cuda fenders and quarters having priority).
These hoods will reflect the same quality as many of thier other items, thinner steel, not 100% accurate, but good enough for many. The price for them is gesstimated at $1,200.00 or so, but that's just a ballpark.
Bottom line? if you want an (accurate) Challenger Shaker hood, you will probably find the Harms kit and an original flat hood your best option. If you want a Cuda Shaker hood that is not only more accurate than ANY current (or probable future) Shaker hood kit OR complete hood, you will also likely find the Harms kit and your flat hood the best option.
If you don't mind waiting what could be a significant amount of time for the Goodmark Cuda hood (they've been promising Cuda quarters going on 2 years now), and don't mind giving up some factory correctness in terms of cosmetic features and details and some metal thickness, then that may be your best bet. Either way we will carry both when available so the choice is yours.