Thread drift warning but "Off the shelf" seldom works 100% for Helos in my humble opinion- unless you intend to operate it in the same climate/role/fit/tactical manner and crew concept as it was painstakingly designed for by the makers. Works for a big transport aircraft- C17 as it is designed to do the same thing just about anywhere.
It's not the saviour everyone thinks it is, compromise is essential.
B71, if you think any aspect of Defence spending is not influenced by a lobby of some kind you're dreaming!