Rosewood Pet Bamboo Tower Cat Furniture

I didn't realize when I purchased online that this "requires assembly". The outer walls come as a flat piece that you roll into a tower and is supported by the two 'floors' which stick to the walls with velcro. My cat will sleep in the bottom but refused to jump up on the top portion because it moves every time he tries to jump up on it. Despite appearances, this is not like other wooden cat condos -- it is not a heavy, solid item. My cat is an elderly, full-grown, 13 lb. cat and needs his cat condo to be solidly in place before he'll jump up on it. But now that he's already used it, I doubt I can return it so we'll just be throwing it out.