If you intend to set eggs every Saturday and run continual hatches, I think you'll have to buy a second incubator, or maybe even two, to use as hatchers. Incubating eggs up till lockdown is fairly clean, but once they pip and hatch there'll be bits of shell and membrane, blood, poop and chick dander all over the inside of the bator, and if you're running continual staggered hatches you won't be able to clean and disinfect it properly. If you use separate bators for hatching in, you can clean them out after each individual hatch and hopefully your cabinet bator will stay clean inside. I imagine you ahould still shut that one down for a good scrub out every couple of months though...
As to your original question though, if it's a fan assisted bator, temp should be 99.5F. Humidity is something that everyone has different preferences depending on their own experiences and results. Incubating is anything from 20%-50% and lockdown is anything from 65% to 85%. If you were going to incubate AND hatch in your cabinet, I'm not sure how best you would deal with the different humidity requirements. I read a thread here recently where someone said for staggered hatches they'd had good results running at 50% throughout the whole process. Hope that helps you a bit...