Not too sure about the reversing switch (presently disconnected ) but will update with this info soon.
Yes, you need to disassemble the box annd change the shift rods etc. as they are longer/different to suit the longer extension housing.
As for KE70, that's exactly what I did. You could just use a TE72 box, that's the same as what I built basically. The only reason I did it was I had a drift victim AE86 box (rear extension) and GC TA22 box available at the same time that I put the 2T-G in my KE70.
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