Good idea, but can you afford to pay out 2 lots of MOT, insurance, tax, running 2 cars etc?
By the time you offset the initial cost of the shed, how long would it take you to re-coup that outlay by not using the Zed?
It may work out more expensive to buy a shed. Thats my 2p worth anyway.
Thats why I never did it and eventually sold mine.