At our house, we like Splendor and Splendor Duel. Splendor has quite of bit of extra space inside the box, so I wanted to consolidate both Splendor games into a single box.
A little cardboard prototyping:
I used my laser cutter with good results. The foam core of the foamcore boards shrank a bit from the heat of the laser. If I build another version of this one, I will experiment with very low power and repeated passes to see if it makes a difference.
I used plain white cardboard as risers so everything would sit flush in the box and prevent pieces from rattling around.
I also cut the plastic card holder out of the original Splendor insert so I didn’t have to make a new one.