This isn't a "when" question, but an "if" question.
Do you intend to produce vehicles such as tanks and armoured cars for your WW1 range? If not, can you suggest a manufacturer who produces 1/144 scale equipment?
How about an armoured car for the Belgians such as those built by 'Minerva'? These were used in the early stages of the war as were armoured cars by other nations.
von Klinkerhoffen
Well tally ho! With a bing and a bong and a buzz buzz buzz!