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As far as I know, the majority of the car is different. Engine mounts are different IIRC. A 1.6 16v is the biggest engine you can fit without to much problems.
The complete suspension setup is different (172 wheels are further apart).
In short: You'll be far better of of buying a 172 instead doing the conversion. Moddifieing the 172 can certainly pass the time in winter months though .