You could also cut a slot out in the bottom of the cowl that allows the two stacks plenty of room. Then just slip the stacks through the slot first and pull forward to get it over your prop shaft.

Watch the real Edge-540 in action this Saturday the 8th on the webcast here.
[link=http://www.redbullairrace.com/]RedBull Air Racing[/link]
Check local times for airing.