Congrats on the Toledos!
1) Pretty durable. I haven't had any issues personally. These do tarnish from time to time though from what I've seen. Makes you wonder if there is a coating to prevent tarnishing. A polishing cloth can be a bit aggressive and should be used sparingly. I would have no reservations about daily usage.
2) Not easy. The only way you could spares would be to cannabilize from another pen.
3) Not sure what you're getting at here. How is the nib supposed to align with the binde? My toledos all have different "alignments" with various sections the binde. No right or wrong. The nib really only screws in one way.
Hope that helps.
Please have a look a the picture below. When the nib is centered, the binds is not aligned to the centre of picture (Toledo on the left, The one one of the right looks OK)