i read a real (as opposed to some nutjob conspiracy theorist) write-up on actual ovens and chambers used by the nazis and the explanation as to why they could not have been used the way they were described was absolutely accurate. i looked up non-related info about ovens and how allied internment camps were arranged and the info on the anti-holocaust write-up was accurate.
one thing i remember is that allied camps also had chambers set up for delousing...the same as the nazi ones that held jews for delousing. ventilation, plumbing, and gaps in doors would have made sealing the chambers for gas introduction impossible. also, the ovens were the same specifications, size, and design, to cook with...not hold human bodies.