Wood flooring in Canberra

Hi All
We are thinking of laying a new wood floor over existing structural floor. Considering solid timbers ( maybe sydney blue gum ) or eng flooring ( NOT floating ) it will be installed by pros and not pre-finished.

has anyone had this done here? The main reason for eng floor option is we get lots of sun on 1 side of the house and there are HUGE gaps in current floor.

As a side question - is ironwood same as ironbark ? would either be good flooring alternatives ?

Thanks for your feedback
Rob :C