TB,
To echo what others have said...this is not your ordinary daily driver. I drive mine to work 1-2 times a week, and many weekends...but frankly, I drove my Kirkham (cobra) more.
Ingress and egress are not easy, as least for taller folks, and vision in any direction except straight ahead is severely compromised. You have to think about where you're going to park to make sure that you can always get the driver's door all the way open...you'll look funny crawling on the ground otherwise. And, beware approach angles...I've dragged the nose of my car on the ground more times than I care to think about. You probably don't need heat...I never hooked mine up. But, be darned sure the air-con works.
My wife won't ride in mine, but she wouldn't get into the cobra either. On the other hand, my son asks me to take him to school in it all the time, and all of my employee's (at least those with Y chromosomes) have asked for rides.
It's loud and it smells, but can be as reliable and any other older car.
Other than comfort / convenience issues, one thing to keep in mind is that the car's limits are so high (speed and handling wise), you really can't explore them on the street. The old adage "Its more fun to drive a slow car fast than a fast car slow" does apply frequently. Not that a GT40 isn't great fun on the street, but it really is bread for the race track. I used to take my old Porsche 912 out on curvy back roads and drift the thing from corner to corner at 8-9 tenths. I wouldn't dare drive the GT anywhere near its limits on the street. Others might, but I'd save that kind of fun for the track.