it's not very difficult! my husband made it for 1 evening! just put all objects on the platform and it;s ready!
i just was tired from maaaany toys at home but my baby was still boring. Then I saw this one in the web site and decided it was what we need. and it was a right decision!
in the web they are rather expensive, 100-150 usd, we spent on it about 30-40 usd!