Don't sweat the foam, I use it in all my MINTs. Why? Cause it's cheap, simple and very effective. I hate velcro with a passion (support group anyone?) and clips can break, foam can always be replaced.
And nice job bhjazz, very clean layout both inside and outside. If you think your 600s sound better with the MINT wait till you get that PIMETA going, and yes I know I'm the devil

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Nate