Hey, thanks! Yes, I intended for the whole campaign to be an expansion that can be played after the core game quests and before the Frozen Horror. I am currently working my way through Prophecy of Telor after getting through Kellar's Keep and Witch Lord.
I also have started a cohort with a couple buddies and we are about half-way through the core game. When I wrote the Heroes of the Grave expansion, I had it in mind to take this cohort through it once we were done with the core game, before we moved on to Kellar's Keep.
I will probably clean up the other four quests and build them into a project and post it here, so you, Ash, and others can get it if you want.
Glad you liked it, and good luck with your Quest!