Naturesrest ILD question

[Oakenfold]

I'm trying to build my own mattress from Mark's 1/2 price bedding memoryfoam.com, the mattress I'm trying to simulate is a Naturesrest Luxury Plush model "Summer Mist", after two emails to the company the boneheads actually called me and left a message but they aren't open, the salespeople at the mattress outlet don't know jack. Anyone have one of these or know the firmness (ILD) specs of the bed?