Okay, so after hashing all that out, Viscaria casts the ritual CrTe 25 spell, "Baroque Peasant Hut" for Wilhelm.
That's Cr 7 + Terram 15 + Affinity 3 + AL 1 + Philo 4 + Mastery 1 + Aura ? + die 1,4 = 39 + Aura.
Int 3 + Prof: Arch 2 + Speciality 1 + die 5 = 11, for the design elements of the spell. Not as nifty as the 26 she rolled before, but ~shrug~ what can you do.
She spends 1 Terram vis, and 4 levels of Fatigue (Imbues with Terram Spirit) for the spell, which'll take 4 days to recover from, I believe. Note that she doesn't let on about the Imbued with Spirit thing, and if anyone asks her about it....well, we should roleplay that out.
Wilhelm seems choked up by the new cottage...Viscaria may not think it's much, but it's a darn sight better than he could have done, and more than he expected. Plus, it's stone, so it's a lot sturdier than what he had before. He'd be real surprised if this one ever gets washed downstream like his old one
I could give some adventure XP, but it wouldn't be much. Practice is probably a better deal, as I think it would be more XP, and goes to just one ability, and isn't limited to 5, as it would be from adventure. I stick to the 1 source per season thing, with the exception of allowing exposure every season for French, as I think is reflected in the HR.