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The next step depends on version.
Later housing versions will not require this step as they are already modified in
production, in preparation for this kit.
If the housing is older, it will have a number of internal ribs which need to be
removed.
The end result should be as shown.
This can be done using a combination of modelling knife, side cutters and pliers.
It is quite time-consuming and takes 20 mins or so.
The end result should look like this (later versions already will be this design):
The charging PCB should fit right down to the base, so the connector lines up
with the hole.