Freezer panels - can i use these?

HI everyone

I shaped my first one last year. a 7ft mid length type of board. I think it came out well, just a lot thicker than I would have liked unfortunately!

I was wondering if anyone could tell me if these foam freezer panels (attached pic)would make a suitable blank and if so what would I need to do? I suspect the foam might be a bit weak?

Thanks for any advice

R