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The fiat coupe was indeed based on the same floorpan as the GTV, where they differed was that the GTV has very clever rear suspension with an element of passive rear steer and this ate into rear space , hence why you can get grown ups in the back of the fiat and it as a boot and not a letterbox.
But yes turning circle is hilarious , I cant get round my local multi storey car park .
Had a fiat coupe for a while (miss it!) which was the fiat version of the same thing (an old Fiat tipo based I think?), but with 5 cyl + 6 speed + 17" 225 tyres = turning circle greater than that of a building. Makes renault megane 220/225 (?) look nimble by comparison. Twice got it stuck in a carpark entrance and had to jack it up/push off the jack to get out without damage.