How to modify speaker box design if panel width is changed?


I'm trying to build a speaker enclosure using Fenlon 7 design ( where the panel width is 15mm.
The standard width of MDF that I can get where I live are 6 / 9 / 12 / 16 / 18 / 25 mm.
If I use 16mm panel instead of 15mm, what changes should I make?
FYI, I'm going to use Mark Audio Pluvia 7.2 HD driver with the enclosure.
Any advice would be greatly appreciated.