I just put the 205 on E85, answering your questions in order:
Yeah I'm using my stock steel lines and standard tank, I gave them a flush through before doing a tune and banged in a new fuel filter shortly after.
Copper and alloy is fine.
Yep replace all rubber lines, I used teflon braid for the pressure lines (so tank to chassis line and filter to fuel rail)
044 is the big one, not sure on that one, how old? What does Bosch say?
Reg should be fine, regs for years (proper ones) have been alcohol/safe
Yep get some bigger units, how much power are you after? 800s should be enough, maybe 1000s at around 3.5bar fuel pressure.
I'm only running a Power FC, not the most intelligent ecu, not rulling a flex fuel sensor obviously and only running the pump e85.
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