See those wooden slats on the left and right?
You can just stack like, 8 of those, that would be 144mm. Plus the “normal” travel, then you already have the depth you want. I don’t know how deep foam can be cut in one go though. 
See those wooden slats on the left and right?
You can just stack like, 8 of those, that would be 144mm. Plus the “normal” travel, then you already have the depth you want. I don’t know how deep foam can be cut in one go though.