This is one of those map sets which absolutely pop out of nowhere. I just spotted this release over at Doomworld and it's definitely a must-play. Hellfire: Reborn 7-level wad for a limit-removing port (PrBoom+ or better should work) where the mapper Shadowman tried to include all the different ideas he had. He also said that this is his first release, and considering this he has done quite well. But time to proof it yourself - screenshots and a download link (bottom) can be found in the forum thread.