Just realised that you need 1 1/8 which makes things easier: http://www.ebay.de/itm/Starrgabel-28-Zoll-Trekking-Gabel-1-1-8-Schaft-Schwarz-V-und-Scheibenbremse-/361400838135?hash=item54252b27f7:g:VEMAAOSwdvpWDoGF but I don't want to derail your plans, alu should be fine :)
430mm a-c is too long for my liking. Makes angles too slack.
@Brainfart_Industries started
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Just realised that you need 1 1/8 which makes things easier: http://www.ebay.de/itm/Starrgabel-28-Zoll-Trekking-Gabel-1-1-8-Schaft-Schwarz-V-und-Scheibenbremse-/361400838135?hash=item54252b27f7:g:VEMAAOSwdvpWDoGF but I don't want to derail your plans, alu should be fine :)