The shell is great now, I had a local guy who has restored several MGBs do it in his spare time. Took three years, but he repaired all the rust and fitted the new drive train. He did a great job.
Looking back at the 370Z, it was pretty hard to drive. Snappy and nervous on the limit. Although, it was a good car.
I think also, when you drive in real snowy conditions you never have to worry about changing grip levels, like patches of ice or so. It's just consistently bad. That means you dare putting the car into a slide on every corner. So it makes for great practice.
I haven't had the chance to drive my S30 in anger, how would you compare it?
The S30 gives you great feedback through the steering and is very 'catchable' . On a track the car can be 'coaxed' around corners by use of the throttle and steering. However my over-riding comment is that 'sensible' tyres make all this happen. I only used 195 on my trackday car and it was a dream. The other thing is the type of tyre - I used 'trackday' tyres and they are very forgiving and break away gradually (I assumed the opposite).
Having said all this I've just watched your 'ice driving' and that is VERY impressive.