I may well be wrong, but I think the Dalek included in the Ideas set will be made up of some sort of new mold. If it's similar to the Dimensions Jurassic World Raptor, it may well be brick built so a) it's cheaper to produce in such a small set and b) provides kids with something to actually build with bricks, instead of two minifigures, to try and justify the price point in Lego's eyes. Just my opinion (and hope) though.