mx5 parked up

Hey i've been on this site for a couple of months i currently own an mx5, i found another one that interested me. same model as my own mk1 the only thing is the whole car is rotted with rust. should i buy it or leave it off, was hoping to salvage the engine out of it. how much should i pay for it too cos i don't have a clue about how much there worth??
Any suggestions
Thanks guys

Any suggestions
Thanks guys

