Envelope Artwork Triptych WIP Part 1

I have been commissioned to make 3 artwork envelopes for someone, so I suggested I link them as a triptych so they can be displayed on the wall together.

A friend saw my last envelope design when it was half finished and said they liked watching it develop, so I've decided to post Work In Progress shots for this one.

Part 1:

Tape the 3 6.5" x 9" brown post office envelopes to an old B&Q shelf with a 1.5" gap between each.