smoothing and de cluttering engine bay

while my engine is out getting re built, im de cluttering and smoothing out the bay ready for paint

now my question is, now i have removed the AC, and heater, along with all pipework, i have all the holes to fill/cover, so

1) do i make an alloy plate and cover the holes from inside the cab area on the firewall (effectively leaving the holes ''on show'' in the engine bay)

2) make a alloy plate and ''smooth'' cover the holes on the firewall from the engine bay, so it looks part of the firewall, and no holes were ever there.

hope that makes sense.

full re wire, and thats getting hidden too,