Douglas Campbell

The OP wrote "...People have steadily became more and more intelligent as time goes on..."
I do not think that is true.
People have more access to information, but I see no signs we are using it better; I think there has never been a time in history more favourable to stupidity, on industrial scales.
Human brain size is not increasing over time.
Mapping apps actually shrink the hippocampus (https://www.scientificamerican.com/article/how-gps-weakens-memory-mdash-and-what-we-can-do-about-it/).

I think that autism spectrum people might, possibly, have done better in more rural communities?
Many of farmsteads had an 'Uncle Someone',  helping around the farm without interacting with people too much.

We never had cats but have had 7 dogs, 3 children and innumerable visiting kids & dogs, woodstove burns 24/7 for ~6 months/y.
One dog once brushed a tail against the ceramic stove window; it made a terrible smell but no harm done.

Blow in cellulose is not too bad to apply, but it is a 2-3 person job; one person blowing; one person feeding the hopper; ideally one person running between.  For a small area/volume one person might be OK.

I just had to replace vinyl siding after a neighbouring fire melted our siding.
I wanted to use vertical steel, with a board & batten look, but feasibility pushed us to vertical vinyl, which again looks like board & batten.
I despise the stuff, but it is what we could get.
More importantly, we put an extra layer of sheet insulation and took the opportunity to seal many air gaps.  It made a noticeable difference house comfort.

I have a daft theory that rugged individualism declines in a gradient north & south of about 37 degrees latitude.
South, the libertarians die of heat & thirst.  North, they freeze to death in winter.
:)

Elm is notoriously hard to split, and very high water content.  Nice job.

Hello Gabriel;
https://www.greenbuildingadvisor.com/  might be useful.
I am not an expert, but I live in a tough climate and have seen many problems.
I think achieving a vapour barrier on the underside of that roof will be difficult;  possibly closed cell spray foam insulation on the lower surface would do it.
It would ruin/change the look of the underside.
A friend recently tried hempcrete in coastal Nova Scotia and it got mouldy;  you might be lower humidity.
If this is aimed for part time occupancy I would be tempted to avoid trying to air seal it; heat the space when occupied; let the air move through.
Many older houses have been ruined by partial vapour barriers trapping moisture between layers.
If you put a rubber membrane in the midst of insulating layers, you will get condensation on the membrane wet warm side (probably the inside, most of the time, in Quebec), unless there is enough insulation on the cold side to stop condensation on the wet warm side.
Also, depending upon your location in Quebec, we will see more temperature and humidity fluctuations.
good luck Doug

We got a 'Veda' from 'Paderno, which has all-metal for the boiling parts, and runs nicely.

A true cord is 4'x4'x8' = 128 cubic ft.
I think some of the higher consumption values must be 'face cords' or 'bush cords'?
We burn just under 2 cords per year to heat a large (2900 sq ft) 2 level stick built house.
We keep it warm over a ~6.5 month burn season in Nova Scotia, but it is well insulated.

I used one similar to the third from left, top row, with a height adjustment, in my office for awhile.  It was OK but clumsy to get in and out.