My little boy is rocket mad and I searched high and low for something for his fifth birthday. He constantly tries to construct rockets out of bits of cardboard and when I came across this I knew I had struck gold. The rocket comes flat packed from Kideco and although I ordered with standard delivery it arrived the morning after I placed my order. It can be ordered in ordinary brown cardboard or white, or if you want to pay more, in pink, blue or silver from their website. We ordered white so that he could paint it. It stands about 5 feet tall and 3 feet wide and there is plenty of room to sit inside. It has two entry doors and plenty of windows as well. It is very easy to build with simple instructions and if you want can be dismantled and stored behind a wardrobe or suchlike when not being played with. Obviously it is an indoor toy given its material however could be used outside on a warm dry summers day. The only downside is my son loves it so much it is crammed into a corner of his bedroom as he does not want to take it down.
Kideco also sell other cardboard play houses, eg. castles, forts, igloos and many more. Cannot recommend highly enough.