I joined habboon I think under the name kittncakes ?? I'm still not quite sure how to stack items xD does stacking items have to do with seeing just the finished room or did you use another program for that?
I stack all my furni in the rooms I made. I can guide you a lil bit, can you add me on skype? My skype is anapanda. with a dot. It will be easier to communicate and I can help you out sometime this week.