Agreed, your precious storage space would be more efficiently used storing finished product -especially if you choose your containers' shape (rectangular, square, sizes that multiply to the inner dimensions of the freezer). This way, you aren't wasting space on peels, rinds, seeds, stems, etc. You could also package the sorbet in individual portion sized serving cups, if you have access to those.
A basic sorbet is fruit puree, simple syrup, with maybe a little extra lemon/lime juice for contrast. It is easily made in the old-fashioned five quart ice cream machines, whether hand-crank or electric, which use ice and salt.
Sanitation should be first and foremost, since the final mix is not cooked, there is a lot of potential for spreading disease. Your machine(s) will need to be sanitized and stored in a clean area.
That food processor appears to be a home-user type appliance. (I haven't seen one in the US.) It costs about 300pounds, and I guess it's ok, for a small home user appliance that doesn't get much of a workout. The reviews show it to be of middling quality with a tendency for the plastic bowls and blades to beak within 2-3 years of typical home use (pulled out maybe 2-3 times a month, tops). Trust me, these apparently 'high end' home appliances rely on the fact that once the novelty wears off, these things mostly just decorate kitchens, they get used on average about once a month. IMO, you'd be much better off saving up, maybe starting a crowdfunding campaign, spending more and getting a Vitamix which has a MUCH more powerful motor, or, getting a professional machine like a Robot Coupe which has all the parts made of metal.