check You tube, or Pinterest as I have seen people do what your question is.
Here's a post that might help - https://homeguides.sfgate.com/convert-waterbed-conventional-bed-93753.html
What are the measurements for the “mattress” area? It may be as simple as putting a mattress in the frame. :)
I just put a queen box spring and mattress inside. A queen fits width wise, just not lengthwise. You'll have a gap..either at the head or feet (I put it at the feet). I just put blankets I wasn't using down in there! LOL
Did you want it as a base? Like a platform? For that you would need support going across. Good luck and stay safe!
This will help you out: https://www.youtube.com/watch?v=N-QLswOFCB0
The water bed has a lot of support going on, a very sturdy structure. It is a frame that supports a large bag of water and sits on a pedestal to keep it off the floor. Everything should be in place for you, maybe just add slats, springs and a mattress. Measure before you buy anything to fit in there.
Hi Pam, here are some instructions for changing your waterbed into regular bed.
Good luck with your project.
www.hunker.com › ... › Furniture › Mattresses
How to Convert a Waterbed to a Regular Bed. Measure the length and width of your bed. A regular king-size mattress will usually fit a king-size waterbed frame; likewise for a queen-size mattress. Buy an all-in-one mattress. Drain the waterbed mattress and remove it. Use your waterbed sheets or buy new regular mattress ...
All you do is drop in the correct size mattress. No box springs needed.
If the dimensions are the same, you can drop the regular mattress into the frame. A waterbed mattress weighs quite a bit more than a regular one so you shouldn't have any issues. I did it with mine many years ago.
They make a spacer to keep the mattress from moving as the waterbed frame is usually a bit bigger than a standard sized mattress.