Steel bar joist design for concrete floor
Hambro is a good system, it needs to be designed by and engineer, like any concrete floor system. It is relatively easy to to install. The supplier will rent you the support brackets for the pour, you will need to purchase the plywood. After the pour clean up the plywood (1/2") and use it for the roof sheating.
I have a preference for hollow core (aka coreslab, google it) if it is available in your area. once walls are poured to underside of slab, you crane it in and start the upper walls...when complete, pour a cap and your finished.
All these concrete floor system are close to the same cost per sq.ft. when finished.