SPOILER ALERT!!!!!

Locations and info for some hard-to-find items needed to build Skaalview Stackhouse...

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Blacksmith's Hammer:
Baldor Ironshaper's house in Skaal Village
http://elderscrolls.wikia.com/wiki/Hammer_%28Skyrim%29
BlacksmithHammer01

Saw:
Deor's house and the Greathall in Skaal Village
http://elderscrolls.wikia.com/wiki/Saw
Saw01

Charcoal (chunk version, not the stick):
Tel Mithryn, and also in Druadach Redoubt Cave
https://elderscrolls.fandom.com/wiki/Charcoal_(Skyrim)#Chunk
Charcoal (NOT Coal01)

Roll of Paper:
The Great Hall in Skaal Village, and there is also a big stack in the Temple of Miraak Sanctum
http://elderscrolls.wikia.com/wiki/Roll_of_Paper
http://www.uesp.net/wiki/Skyrim:Roll_of_Paper#Roll_of_Paper
PaperRoll

End tables and cupboards may also contain charcoal and rolls of paper.

I hope this helps!