OK so I oultlined exactly what I have, sure you don't NEED all of them but given Frank's budget build and advice, stock motor gone, stock clutch slips etc...
I was really only mentioning clutch etc because I need them personally on my spare engine/gb combo, but at the end of the day you are splitting hairs over whats required and whats not.
Bare minimum, look at frank's build.
For me:
turbo
manifold
intercooler
pipework (all boost piping)
dump pipe
injectors
oil feed/return (pickup from oil pressure switch and return to the top of the sump)
water feed/return (convert banjo and pipe fittings to BSPT and braided lines)
intake pipe + filter
So I haven't omitted that much after all compared to the original list 