I painted the one in 1st picture with a concrete colour then flat aluminium for the inside. They slightly overlap so the glue will stick both ends of the paper together aswell creating a more durable bond.
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4FT PICKET/GARDEN FENCING LASER CUT TT:120 GAUGE & 1:120 MODEL RAILWAY-LX516-TT
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TT-PS002 Single Sided Platform Twin pack TT:120 Gauge Laser Cut Kit