I don’t know if it helps your prelim calculations but our 3rd party Verified 2018 LCA on our wood planks for interior walls floor and ceilings came back solid… negative carbon A1-A3 we are at -8.09E+00 / GWP 100 (kg CO2 eq).
I can get you the docs if you need or find them @mafi.com
Sounds like you have some good help on this forum.
Walter Lourie
Sustainability Manager for mafi