Joining two solar panels so they open book style

or rather like they do in the piranha advert. I am just keen about it as a space saving device - i know a one piece 80w unit is cheaper and simpler but i want to investigate this anyhow. So has anyone done it ? I am principally thinking of joining 2 BP SX 40W panels like this as they come with the mulitmount frames they make this appear to be simple. If it is in fact simple to bolt them together with hinges, do you just then rewire the positive from one into the positive from the other and the positive from that then goes out to wherever you want it to go - and is it as simple as that or do you join the wire onto the other panel's terminal rather than to its positive wire (do they have a terminal ?). Any comment or speculation appreciated.