Hi, If you want to do the platform in addition it will all most likely be too expensive. These are all custom mattresses which are each about $1200 to make plus the cost of the fabric. I can't remember the cost of the platform for sure but I think it was around $2000. So, for a rental I can't think of how you can do this inexpensively. There may be pre-made cushions on the internet that are for pool furniture or something that you could find. That's just a thought. If not, maybe one day you can do it like this in a home you own. Good luck and sorry I couldn't be of more help.

Check out Pottery Barn's $300 cushion: http://www.potterybarn.com/products/stratton-daybed/