OK so I just jotted down some notes.

1. Plaster Tier - 10,0000 HP. Crafting Requirements: B.O.P. + Thatch + Wood
2. Wood Tier - 12,500HP
3. Stone Tier - 15,000HP. Crafting Requirements: B.O.P. + Bricks + Wood

Bucket of Plaster (B.O.P.) - Clay Ingots + Water + Flint
Bricks - Clay Ingots + Brick Tray Baked in Medieval Forge

wood tier. B.O.P + Wood + Nails.
Nails .. smithy - metal (would require a BP and 1 engram point)
Nails .. Medieval Forge : Metal + (flint maybe or charcoal)?

If I went the nail route technically all the pieces would need nails. I could do a bucket of nails but then like I said I would need to add that to the stone and plaster. Maybe thinking lumber.

The default set uses raw wood which I equate to a log cabin. Lumber is used as a finalized product.

So instead of nail replace that maybe with a hand saw. 2 Wood + 1 Hand Saw = Lumber & 19/20th Hand Saw? Using hand saw dulls the blade and blade must be sharpened. I do have a sharpening stone. Just didn't know what I could use it with.

Thoughts?

Hand Saws would work.

Crafted in a smithy using wood fibre and metal.
We can pretend that hand saw's where white goods back in them times, so once they dull, throw them away and use a new one.
Hence
Wood tier = 50 wood + 10 Hand Saws (for example)

Would it be possible to have the hand saw engram pre built into the smith ? so no more points are needed to purchase it ? or set the engram point cost to 0 (with a pre requisite of knowing the smithy

Ya, set the engram the same way the plaster and concrete are now

I could add a sharpener to the blacksmith table top and then make it repairable only at the table too, or like you said throw-away-able

I like the idea of the saw going dull and needing sharpening, but i feel you will lead yourself down a long path of a lot of work.
You would have to have the saw equipped and take damage each time a wood structure is placed.
Would you add a sawing animation to it ?
Maybe this is something that could be added into the mod at a later date.

Using the handsaws as a resource time sink is ample for now. You can always revisit it at a l8r date.

Definatley no animation. I would just use that as like a durability thing. Instead of crafting 1 per 20 wood or so, which would be my other option.

What resistances do the tears have. Are any of them metal resistance?

crafting these are more expensive and complicated than vanilla structures

just make all the structures "stone-type" with the same HP as vanilla stone so people can make nice-looking homes without worrying about dino damage or pvp balance. nobody seriously builds with wood-type - it would only discourages players from actually using the mod

aesthetic-only, please