$261.52 for the metal tiles. They don't go all the way back though.
12 sheets of 1/4" birch plywood @ $20/sheet = $240
I don't remember what the furring strips cost. 8' 1x2s, we used maybe 100 of them, about a dollar each.
Do your own calculations for insulation, we used spray foam kits and they were expensive nightmares.
Around $650 including supplies, screws, paint etc.