John,
Thanks for the compliment.
There's no magic with the walls! I've been collecting courier "envelopes" for years ( I was thinking of asking DHL for sponsorship!). The card is the right thickness, so I cut out pieces just a bit smaller than the walls and use "Photo Mount" spray on the card. It's a chemical glue so doesn't affect the kit - unlike water based glues that can warp the paper.
Cheers
Mike
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