Hi there! 

I'm going to be trying to recreate the middle and top tier of this cake for someone and I was needing some advise on how to achieve the cracked paint wood look of the middle tier. I would greatly appreciate it! Thanks!

I think this tutorial is what you need. I've never tried it though.

https://www.cakecentral.com/tutorial/61892/how-to-weathered-fondant-tutorial-using-wafer-paper-crackle-effect

The Edible Aged Painted Wood Effect tutorial by Kara’s Couture Cakes is a great tutorial for this effect. I used it to make the driftwood tiers of the cakes below.

WOW!  That tutorial was amazing!!!  Thank you so much for sharing.

I've done the technique, posted by Laetia, many times and it is very easy and beautiful.