When I got married and moved into a waterbed I found it very hard to adjust to, as not being used to sharing a bed would have been enough but then with the waterbed if he moved I was bounced out, or at least against the boards. Not fun. Also, I found my arms would often be numb when I woke up. Well, the mattress sprung a leak when we were trying to move it and we got a pocket coil mattress, and I sleep sooooo much better!!!
With the weight difference between you two you would definitely need some kind of system where the water doesn't move much. Also, we slept on a waterbed somewhere where instead of a wooden frame around the mattress it was like the bladder was inside a regular mattress. I still got bounced around when my SO rolled over but atleast there were no boards to hit and it was much easier to get out of. Hope that gives you some ideas.
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