Graham,
many members are currently at the Eribafolk forum Spring Meet, so responses may take a while, with limited internet access and other distractions! Don't worry about the head height, I am 6ft 1inch (female) and I manage....you'll bump your head once, maybe twice! We are eagerly awaiting our new Troll too. July delivery gives you plenty of time to enjoy the 2018 season.
Anyway, you are very welcome.
Simon & Lesley