Hi Andrew,
 
Thank you for your enquiry, this is not something that I have been asked before.  Placing a base on a sprung slatted base would not be very stable, maybe if you boarded over the slats giving a uniform surface for the base to sit on, but even then I am not sure it would work.
 
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The height of our bases are 12 or 13 inches, this would make your bed very high.  The Contemporary platform base and the Artisan sprung base can be made at a reduced height for an additional cost of 10%.  The shortest height we can make these bases is 6 inches. These are constructed from Canadian Spruce which is a hardwood and maybe too heavy for the sleigh bed especially with the added weight of your mattress.
 
I hope this is helpful and if you would like any further information please do not hesitate to contact the office on 0161 437 4419.
 
Kind Regards
Michaela