The screen on any modern convertable is very definately a structural part, in most cases, roll over protection. Cutting it off would definately create structural issues, and paperwork nightmares. Most old sportscars, and many american cars still, have seperate chassies (like a landrover..!) so you can do pretty much what you want with the body without affecting strength. On the other hand, keeping the screen gives you proper, non-buffeting, open top motoring. (If you have ever been in a cobra at speed, the buffeting is dreadfull..) You also get proper wipers, de-mist, windows that fit, and a top quality hood that doesn't leak.....
This car will not please the purists, but there are plenty for them...
If i had the chance to build this Kobra, i would do it with a modern twist, with big modern wheels, LED lights, etc... And it could be parked outside and used 365 days of the year no worries..!
I like it, and i want one...!
There's my tuppence worth, hope some of it helps someone....