Just finished this book and I really enjoyed it.
It has all the ingredients for a good DCC adventure, patrons, dimensions, alignment, fantasy + sci-fi, etc.
Not in the Appendix N list but IMHO I think it deserves a chance.
Check what other writers say about him"Influence
Marion Zimmer Bradley is among many authors who have cited Kuttner as an influence. Her novel The Bloody Sun is dedicated to him. Roger Zelazny has talked about the influence of The Dark World on his Amber series.
Kuttner's friend Richard Matheson dedicated his 1954 novel I Am Legend to Kuttner, with thanks for his help and encouragement. Ray Bradbury has said that Kuttner actually wrote the last 300 words of Bradbury's first horror story, "The Candle" (Weird Tales, November 1942). Bradbury has referred to Kuttner as a neglected master and a "pomegranate writer: popping with seeds—full of ideas".
William S. Burroughs's novel The Ticket That Exploded contains direct quotes from Kuttner regarding the "Happy Cloak" parasitic pleasure monster from the Venusian seas."
(Quoted from wikipedia)http://en.wikipedia.org/wiki/Henry_Kuttner
If you want to read it here you have it (rights expired)http://manybooks.net/titles/kuttnerhoth ... world.html