The lack of Power steering on a car like that is just harsh. You would have to wrestle that thing around the track.
As a mechanic I have to respectfully disagree with that. It's a common misconception. Three factors determine how difficult a vehicle is to steer...
1) The vehicles overall weight and dimensions, versus the size of the steering wheel.
2) Whether the vehicle was supposed to have Power Steering (if the PS is dissabled it can cause problems depending on the make/model of the vehicle and how many pulleys or belts the are being used to power it).
3) And the third and MOST important is the vehicles speed or motion. The faster the vehicle is going the less difficult it is to steer, and that goes with any vehicle, not just Porsche race cars.
I have a 1966 Chevy stepside that doesn't have powersteering (designed before PS was common on cars), and a 1988 GMC Sierra with no power steering (that was designed after PS was common). We use these as work vehicles at our farm and they do fine. The '88 is a pain sometimes when your having to steer at a dead stop (especially in mud or dirt), but as long as its going it steers fine. I suspect that at the speeds involved for that Porsche to scoot around a track, combinded with how stripped down the weight and trim characteristics are on the frame and body, you might be surprised that you could steer it with one finger over 100mph, not that I would want to try that at that speed. The smaller the steering wheel, the more difficult it is to steer at slower and slower speed, so yeah, it might be like wrestling a bear at a dead stop or 10-20mph.
Sorry not trying to come across as a know-it-all, but I just have experience in this area.