1:18 aircraft photo-etch is among the rarest material in the catalogue, simply because only a handful of kits exist at this giant scale. What there is includes a cockpit upgrade for the Fw 190, matched to the kit named in the set title, plus small metal fittings that take the place of simplified styrene detail on an airframe getting on for a metre across.
1:18 is an exhibit rather than a shelf model, and detail counts here more than anywhere. Look for the starting airframe among 1:18 aircraft model kits, find the smaller sizes and the rest of the range in aircraft photo-etch sets, and get hold of decent modelling tools for folding large frets. The bigger etched parts at this scale also take epoxy, which gives you time to line them up.