The question https://diy.stackexchange.com/q/3712/21 is an example of a "non-home DIY" question, i.e., a question about building personal property that isn't part of your home. It's a good opportunity to further clarify the scope of the site. (Previous discussions: Home Improvement or DIY - scope change to grow site and DIY vs Home Improvement?)
At first I thought it should be off-topic, just like computer repair and car repair. But the question has attracted a large number of views and several answers, so it seems to be a good match to the community. (Or were the views perhaps because it was linked to from another site?)
What do you think? We have previously decided that appliance repair is on-topic.