If ferrosa is same as sportrak then removal is fairly easy but time consuming. Remove both front seats before you start. If the instrumentation is the same as a sporty, there are hidden screws behind the central 'dials/clocks'. Your will need to prise away the surround to find the screw. Other hidden screws are behind the windscreen air outlets - again prise away the surrounds to reveal the hidden screws. The remainder are obvious ... bolts at each side by door pannels and another below the dashboard/baulkhead.
Take car when lifting/pulling away the dashboard. Lots of wire and heater switches to damage. You can access the heater unit just by lifting the dash, do not remove it from the car : lift/suport whole dashboard onto wood blocks so you can access the heater unit. On UK models the matrix slides from the heater unit to the R/H sidelooking towards the windscreen.
NB .. detach the heater pipes on engine side of balkhead.