Good stuff! I'm running this for two groups, set in the Mror Holds in Eberron. I've added some city options at Korunda Gate and augmented the exploration stuff, plus put a 30-day time constraint to get the adventure done.
The first group opted to make their PCs be part of an adventuring guild founded by their characters from a previous campaign. True to form, they assaulted the Mountain Door head on, gave as good as they got, then retreated. Then their next master plan was to do the exact same thing again. They succeeded at breaching the Mountain Door and killed a ton of orcs and Old Yarrack. They destroyed the bridge, then took a long rest. Later they found the secret door into the orc barracks and used that to infiltrate, taking out Ulfe and the dire wolves plus a handful of remaining orcs. Now they've descended into the Glitterhame.
The second group decided to be journalists for the Korranberg Chronicle. They were a little more cautious so they explored the area of the Stone Tooth before going in, finding the siege tunnel. So their first contact with enemies was the troglodytes and then the duergar. (It's like they beelined it to the Foundry.) They had to flee from the duergar though. Later they went into the natural chimney and started fighting orcs. This ultimately led to their capture as the orcs started swarming. They later mounted an escape back through the natural chimney, but one PC got left behind along with an NPC captive. (I changed the captive commoners to Sister Lourda Mercy of the Silver Flame). So the party was split, didn't have their stuff except for their clothes, a shiv made out of a rib bone, and one item each that they could keister to keep it away from the orcs. Ultimately they decided to lure some orcs out of the dungeon, double back, take out some remaining orcs, rescue their friend, then escaped in a harrowing scene. Now they are contemplating heading back to Korunda Gate to resupply and return.