the heater matrix is a b!tch of a job i found. i only took the center console out, and the haynes manual (or as i like to refer to it the haynes book of LIES!) didnt mention the two studs that secure the matrix to the bulkhead located on the engine bay side. so i thought that i had to pretty much dissassemble the box to get it to come out. after an hour or two scrambling around in my footwell in 32oc heat, red faced and angry i decided to search the internet for a removal guide. surely enough it told me about the studs.
I found refitting the matrix with these studs in place was impossible, without taking the dash out. so i just screwed them in from the engine bay side. easy.
Also, i stupidly took apart the whole matrix unit, and forgot to fit a flap back in which shuts off supply to the footwell when the screen is selected. now i have one very misty valver and very hot feet.
i might take it all apart again, but only when it gets colder

still id go for it mate.
will probably take you 3hours to do the matrix.