I use a hollow core door set on top of a daybed (Hemnes from Ikea) as my cutting table. It's perfect for me, but I'm fairly tall, and many of my friends find it is too high. You could look into getting easily removable table legs (I know Ikea has some at reasonable price, but you could find them in a hardware or home improvement store, or fashion some from pipe flanges and pipe lengths. Then you could create a table that sits above your bed and is stable, but can be removed relatively easily.