50 inch x 22 inch x27 inch i dont think the 1500 watt element will cut it.
i know those figures have been taken from that calculator but i don t really beleive those figures.
your oven is about twice the size of a household oven wich already uses more then that 1500 w
i would go for 3000 watt minimum even ore if your electrical supply can support it.
i came across a place that sells elements in the uk .heres the link
http://www.elementman.com/
for the thermostat or pid controller . look on ebay for (pid controller) i suggest you check with your electrician an then call the seller to make sure it is compatible with your electrical supply .you will also need a relay that is compatible with the controller and your electricl needs to drive the elements
