We also did the same thing-bought a foam topper for our bed and it works fine. Just had to trim the end corners to fit around the sink and corner wardrobe. Bill loves the king-sized bed and will probably never go back to a queen which is what we have at home and what we had in our first 5th wh.
The bedroom is very spacious and we both enjoy having more room than we previously did.
We also had a bunch of pillows on the bed when we bought the unit-this is the pillow option, I believe.
BH 3600 RL, site #411.