we have moved house and have a huge corner spa bath and I am planning on spending as much time in there as possible before we leave for the hospital. This was by far my number one comfort during my first labour and as soon as I got to the hospital and they let me stay (had been sent home twice) I took the gas and got in the bath and coped just fine after that.
It sounds wonderful! You might like it so much you might just stay there and have a baby!