had a quick look at this the other day but couldnt see any screws for the back plate and because wiring was too short at the back couldnt get it all the way out to see if it can be done from the rear. seems pretty daft design to me!
some candy ovens have no backplate and the fan and element are accessed by removing the rear casing and then removing the sub assembly with fan motor and element
philips EKC006 branded ECKO had a similar design-removed from the back, havnt seen any of these for years, they used to make a double oven -2 single oven size, not the usual 1 and 1/2 size, they weighed a ton!