That's a beauty, it's impressive what you achieved here with these assets. I'm definitely in favor of going with that style.
Those big sidewalls pieces could result in some framerate drop; iirc Worsas suggested not to use them extensively. They can easily be replaced with blocks or platforms, so it's not really a problem. And aren't the blocks in the floor (not the ones used as rests for urns or corpses) slightly too high? Haven't checked in-game yet though, and screenshots and CS view can be deceiving.
roerich wrote:The barrows should be made using a combination of exterior and interior barrow pieces, along with green'ish lights and mist statics. They should look and feel old. Some of them should be looted, or parts of them at least.
Agreed about the atmosphere. Some warmer lights - lit firecups, cave lichens, candles in tended barrows - would make cool contrasting points tok, I imagine.