These days with Covid-19 affecting everything, it’s hard to know what kinds of truly practical offerings to post, given the changing times. I live near St. Mathieu and have stopped in/motorcycled through it fairly often. Maybe that gives me enough experience to perhaps offer a couple of things in case they’re helpful. I assume you’ve seen these websites: http://www.saint-mathieu.fr/ and http://www.saintmathieulac.fr/
One thing for sure: you have to know about the history of the area, specifically the astroplast/meteorite. It hit the area around 200 milion years ago (give or take 15 millenia). The rock that you find onsite/use for building might be stone from the astroplast/meteorite. It’s considered a bit of a tourist draw to the area and there may be some restrictions or stipulations for its use, if you have it on your property.
St. Mathieu does/did seem to have better-organized music events than some of the villages of its size. Can anyone speak to these, in more detail?
It’s near the Piegut-Pluviers market which happens weekly, on Wednesday mornings year-round. But surely you knew that already?
There’s a small supermarket (closes from noon to 2pm) conveniently located close to the center of town; there are a couple of bakeries… or, at least there were a couple of bakeries. Also a small library. The gas pump near the supermarket has a nice conkers tree next to it. The gas pumps’ credit card machine can be cranky. Or, at least it was. I noticed the SuperU in Chabanais has all-new credit card machines at its pumps; perhaps St. Mathieu will follow suit. Then again, Rochechouart has an Aldi and a supermarket, not to mention a couple of almost brand-new gas pumps.
I don’t know anything about St. Severin.