I/O panel filtering for shielded room
You can read about &quot;bulkhead&quot; connectors for low/moderate DC power, or logic level control signals.
Otherwise you need a 6&quot; by 6&quot; by 20&quot; power_line filter, bonded to the steel/copper of the walls.
By the way, aluminum oxide forms INSTANTLY upon exposure to air, thus the aluminum will not make ohmic contact between the various sheets.
There will be high capacitance as you crumple the sheet_edges together, but not ohmic.
C = Eo * Er * Area/Distance
C = 9-12 farad/meter * (Area = 2cm * 50cm)/100 micron
C = 9e-12 farad/meter * (100 cm * cm) / 0.0001millimeter
C = 9e-12 farad * 100/0.0001 *  cm/meter * cm/millimeter
C = 9e-12 * 1Million * 0.01 * 10
C = 9e(-12 + 6 -2 +1) = 9e-7 = 0.9 uF
which may be adequate even at 10MHz.