Ye i will come around to show that later on, have built on iron weights under the baloon to hold it upright, tho ofcourse, even with that added on it's hard to say if it's even flyable, they might go with helium to decrease a igniton risk, hehe. But in general, yes, i didnt have in mind to make the top that big in comparison to the baloons underneath.
I am glad that you pointed it out, now i got a reason to put more effort into showing the thought of that specific key object! :)

Tho, fantasy can be very unrealistic ;)

Look forward to the final result!