Read the whole description. Oddly enough, I've found instructions on how to make nipples for Barbie, but can't seem to find any stables o.O I did find a general toy stable, but no instructions. There are a lot of results for stable toys (for horses) mixed in so it's a bit troublesome finding truly related things. I think your best bet would be to find a cardboard box the right size and draw on it/cut it up to make a template. A good non-toxic wood glue would be the best way to connect the pieces.