1) - dont think you are going to get an answer to this
2) - yes
3) - no, how long is a peice of string depends on how abusive to your clutch you are.
4) - no
5) - there is no specific, I have 6x10mm holes Fontyyy has 2xholes Dave has cut the front off, Andy doesnt run one.
6) - again depends on the bikes life but all NSRs are imported so they are sprung for the Jap market so for £80 get it rebuilt.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold