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Yes, yes
Probably
Yes
Why do you want to do it? A lot of work.

 is 6 gears really needed for these?5th is soooo long I wouldn't bother. Custom mounts will have to be made, probably custom drive shafts, then you have to work out if they will fit the hubs etc.
If I was spending any kind of large money on transmission it would be for the 5spd SQS Gearset.
It won't fit between the chassis legs