Without any comment on the timeframe of modelling:
WW1 types are
utterly primitive compared to their WW2 counterparts. CEM in WW2 is a totally different beast than in WW1. All those technological gadgets of WW2 (i.e. Radar, radio systems, radio beam systems etc) just weren' there in WW1. As such the amount of systems to be modeled is infinitely greater in a WW2 crate. Some people should take that into consideration before they let out the warcries and start besieging the 1C office complex.