@welcome2atlantis Well, yeah... Building a house isn't
that hard. I've helped build bronze/iron age houses for parks/musea in the past. Most of the techniques involved is "see once, good to go", and generally unless people are genuinely clumsy or incompetent most people willing ( including kids) can join in and help out building one. Which was how it was done in those times anyway.
The Isekai Cheat bit here is the
speed at which the house was built... Ordinarily you'd need 3-4 years to build something like the smithy, especially if you're using dressed stones like drawn here. With half the village turning out for the critical parts. Doing this by yourself.... It'll never be finished.
And that's not counting the 2-3 years you'd need to prepare the wood used... As-is, they're using green wood.. That's a ....Really Bad Idea... Especially with a dressed stone upper wall...