I do remember the instructions called for a hole saw in Metric, but a borrowed 3/4 " worked fine. When I installed my lower fairing last week, the instructions called for a 12 mm hole saw, and my friend did not have one or even a 1/2" . Neither did the local hardware store. I used a 1/2" pilot pint drill and got along fine.
When I installed my top box, I first sorted and put parts together and made notes on the instructions while at my desk. It went together fine, in the shop after work, until the very last part. A female co-worker with tiny hands happened to be working late in the office and was very helpful with the last two fasteners.
The top box is my most used addition. When it is real windy, I sometimes take it off if not needed. It does catch some wind.
Do not forget to stuff the rags in the hole as mentioned to catch dropped parts.
