Welcome, looking forward to viewing your projects.
Something you may consider if you have the availability of horse or farm animal manure and hay you can create a compost heating system that will produce heat for about five to six months out of the year.
So far I have not seen anyone run large diameter pvc tubing through the thermal mass and used it like an Hvac heating system.
Transferring the heat through the pvc and then using a pc fan to pump the heat via twelve volt batteries and solar.
As well you can produce hot water on demand.
I have heard the shortfalls of such systems due to the maintenance every five or six months time, it is labor intensive.
But that shortfall can be addressed and a system structured to take much of the intensive labor out of the equation.
I have a few idea on that subject and will probably do a video on it rather than describe it here.
My fingers get tired:>)