'fleet/taxi' wiring bypass diagram.

Big thanks for this reference, seems not a lot harder than the madelectrical fix, IMO. Now a couple of questions regarding the diagram:

- Calls out 6ga wire from alt through a terminal to the bulkhead; can it be 8ga?
- Calls out a terminal block which splits out the alt lead to a fusible link/10ga wire to
bulkhead connector and continuation of 6ga wire to ammeter

are the connections at the terminal block 3 ring terminals on a single post? (sorry for the bifurcated post, fat fingered it!)
- Calls out 16ga wire from starter relay to ammeter red post, while 6ga from the
alt, I'm assuming that's to ensure as little loss from alt as possible, hence the
HD nomenclature?

Thanks for any clarification you can provide. Cheers!