@ziggyzecat, thank you so much for your super detailed answer. I'm indeed looking for a low budget at first. He is on the spectrum and super smart, but his hands are not his best allies. Despite all his efforts and work with specialists, he remains clumsy and might involuntarily damage his computer. Cheap and fixable is a good thing. Things will get much better with time.

I love the idea of building the network as a family project with him!!!