Goliath storage box

Hi. I just received Goliath and am getting my head around slingshot and inkjet. Can I ask anyone that has constructed the storage box project…
For the cut settings in slingshot, is it the ‘outside’, ‘middle’ or ‘inside’ option?
Also, says for 10mm ply, but I can only source 9mm ply. Is it worth altering the drawings or will the missing mm not be a big issue?

Hi. I’ve made this with 9mm ply and haven’t had a problem with the material thickness. However, I have found that the joints don’t line up in the Final Cut version. I’m still trying to resolve whether this is because of my setup or the project file