You need to get hold of a copy of the South Asian restaurant trade mag ‘Spice world’ loads of ads for commercial tandoori ovens!
You also need to fit some major league extraction. The heat given off is pretty phenomenal. When my local takeaway’s extraction broke down the heat in there was utterly extraordinary – not uncomfortably hot, unbearably hot. Its definitely something you’d want to do outside unless you were building your house around it – in the way you might configure a house and and its systems around a Aga or a Rayburn. – but even then its much more fierce.
In my daydream Grand Designs house the heat and hot water would be run from a tandoor so that I’d have to make a duvet-sized nan bread every time I ran a bath. Mind you my Grand Designs fantasy house has a third tap in the kitchen – ‘hot’, ‘cold’ and ‘hummous’.