Elven trade sometimes asks for mushroom caps or toadstool beams, so I decided to make a toadstool cottage for a steady supply of caps. I did a bunch of adventures, bought a level 1 cottage, put it into storage, and crafted a toadstool cottage in Builder's Guild. However now I see the cottage is still in my storage. Also the Builder's Guild interface only asks for beams and blocks (admittedly, I do not remember if was ever different). Does it mean base buildings are no longer needed?