The gearbox has a fill plug on the side about half way up (ish) - the drain is underneath. It is a fill to spill type affair / fill until spill which ever way you wish to look at it. The thing in your picture looks like a modified bit that was once the / a reverse selector switch for the reversing light.
At a guess I'd expect all that extra rag wrapped around the gearbox to be an anti-noise attempt.
The removable transmission tunnel isn't an original feature - that's a modification - usually done to make space for an overdrive.
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