Cubase with soundcraft Si Impact

I’m considering using a Si Impact for use with Cubase 8,5. Both for input and playback, as well as downmixing. Anyone who has experience with setup of this or a similar mixer?

same question here how do you get the usb outputs channels(33-58) of the si impact, to record on separate tracks in cubase.(channels 1-24)???

You connect them to the different Cubase busses as explained in the manual, then select the proper inputs for the tracks.