Here's what I did with the template:
View attachment 1600122
I actually did the envelope from scratch, which was not a big deal:
View attachment 1600123
The fact that I work in the advertising industry helped me to cut the model from glossy metallic gold vinyl. The pull off of the excess material was all the fun I needed:
View attachment 1600124
The assembly of the envelope was achieved with some thin double sided adhesive tape:
View attachment 1600125
View attachment 1600126
Then I transferred the cut out vinyl from the backing paper to the envelope with a piece of clear transfer tape:
View attachment 1600127
And for fun, I printed 3 dummy 100 USD bills to complete the task:
View attachment 1600128
View attachment 1600129
Here's the envelope template in A4 and Letter formats, which contains 3 pages: 1st page with blank envelope template, 2nd page with gold model and 3rd page with the 100 USD bill (print it as full size, not fit to page or other options). On the A4 format the side flaps might not print fully, but there's enough paper on the sides to draw the missing parts.
Have fun!