Doors
Are you kidding ?
They were designed to be removed by a 'user', it is all clipped !
If one continues this line of reasoning : can you put the controls, may you wash it, may you open the engine doors...
I would be more worried by making sure the pilot had at least some explicite training the fly without the doors (or in rudestuff's case with the doors)
During that training one would also be instructed how the remove, store and remount the doors. This is part of required technical machine knowledge imho.
d3