Concrete Over Plywood and Hardibacker

Q: We currently have plywood subfloors in a 1980’s 1 story home home. We are re-doing the kitchen floor (100 sq ft.) We have the Hardibacker and were getting ready to put it down as a subfloor for ceramic tiles. We have since decided that we would much rather have a cement floor and are wondering if it is possible to use some sort of “light” self-leveling concrete mix over the hardibacker instead of tiles. Is there any way to go about this to avoid the entire cement floor from cracking and how thin could the concrete be?
A: If this is truly what you want to do then you will need to mortar and screw the hardibacker to the plywood subfloor. Following that you will need to purchase a latex concrete primer, roll the primer on the backer board then top off with a product such as Raeco R50. Which is a latex mortar overlayment that is meant to act as a wear surface. After you have completed all of this, you would then need to finish it with an epoxy top coat.
Roughly put this is a lot of work and you will get a very flat and simple look. Now keep in mind this is about as much work as you would end up doing in order to put down stone or tile. If you choose to go the concrete route, keep in mind that just pouring a thing layer of leveling compound will not suffice as a proper surface.