My take: if it's for a permanent or semi-permanent part of the house, it should be in scope. Something that would or could be (for example, a bookshelf that fits in the nook under the stairs, or a daybed sized for the curve in a bay window) included when you sell the house.
By that guideline, "wooden blocks" and "convex-fronted chest" are out of scope. If you look at the "pine furniture" question, it's actually about how to prepare the wood surface for painting, so it would be useful in other cases. "Height adjustable desk" is narrowly in the on-topic side, mostly because the first thing I thought of when I saw the question was a cantilevered support structure bolted into the house's framing.