what did you use to cut the foam?
I used a combination of things. For the most part, I used a hot wire to cut the foam. It was going well for the most part except we kept overheating the transformer. Needed a bigger one but didn't have one. So, on the 2nd layer with the mags, I cut those with a 3 inch long razor blade and a ruler.
A couple things I learned. Tape off the whole thing with blue tape. Then draw the cutting marks on the blue tape. This way you don't leave trace lines. But then again, I also think it looks cool.
I thought about using a electric carving knife but I didn't know how precise it would be. I do have some more foam to test with so maybe I'll do my next one that way.
And the biggest thing, go with Closed Cell foam rather than the open cell foam. It's a little more dense and firm and easier to cut with.