Here are the first 10 rooms of the Long Dark of Castle Redhelm. This map was used via Dungeon Scrawl, and it looks pretty good so far. Most, if not all, of the dead ends continue on to other areas, but I'm featuring the first 10 rooms thus far, so you can get a good look at it.
In terms of stocking the dungeon, I'm using the OSE standard method, found in the rules tome. I'm happy with the spread of various encounters, but I do find the treasure a bit light, hence why I added the sword. Do I expect PCs to swim to the bottom of the vat? Probably not. But just in case, there's a pretty powerful weapon within.
I'll do a completely separate post on the factions I'm including in the dungeon, as well as random encounters per level.
Anyways, here is the start to the infamous LONG DARK OF CASTLE REDHELM.
