I designed it in 3d MAX and unfold it. After editing the texture in Photoshop I pasted the texture to the 400g card stock.
To make the steps solid , i cut the step shape with 800g card to stuff in to the shell.
The test assembling of the steps to the floor tile:
The making of main tower:
[Blocked Image: http://www.cardmodel.cn/data/attachment/album/201310/04/091914xthpppb4pg47bagt.jpg]
adding the roof, the roof is printed with 160g card.
[Blocked Image: http://www.cardmodel.cn/data/attachment/album/201310/04/091926b61n916fivni4vj5.jpg]