Looks like a load of fun. We have them here in Ireland too, re-enacting everything from Vikings to Napoleonic and ever Irish war of independence and civil war.
At the dropzone I used to fly for we had a bunch of 'paratroopers' turn up to learn how to parachute for real. A couple of Fallschirmjager and 101st airborne in full gear. They were hoping to take part in one of the jumps in Holland or France to commemorate D day and Market Garden so they wanted to get some experience. But of course they also needed to jump with round chutes to be really correct.
Their gear was very authentic but replicas of course. Genuine Fallschirmjager helmets cost thousands of dollars and even para versions of the US M1 helmet make top dollar.
If you tried to use genuine WW2 gear you would go broke fast. But some of the reenactors here earn some money doing TV and documentaries where re enactments are needed.