In theory,looking at a certain Peel specialists site,IF you knew what all the parts were off,and IF you could get hold of them,doesnt matter about timescale,treat it as a resto,you COULD if you bought say a Trident shell and dome,build your own replica Peel,but as close to original as possible,for significantly less than buying a built replica or indeed a real one.
Simply for the enjoyment of owning a "Peel" and taking it to shows and rallies it would be worth doing,no?