If i was to do this conversion i'd buy the spigot new from nissan/justjap($10 at most), clutch master and slave from peps in artarmon(new non-gen)(roughly $150 at most), braided clutch to slave line from pirtek/enzed or a rubber one from a vl(not sure on price there...$10 > $150 at most), aftermarket lightened flywheel.
As for the box...i saw one somewhere on here in brissy for $600. Hunt for second hand one from private sale. Tailshaft half from sss automotive, jpc lansvale, justjap or gms revesby.
Does the pedal box on an r34 need all 3 pedals or does the clutch pedal bolt in separately? May be able to use a 31/32/33 pedal box or just the extra pedal and cut auto brake pedal in half with hacksaw.
Should be under 2k easy doing it that way.
Hope some of that helps. Good luck!