I can't see the advantage of a pin on hood. When you have a glass hod there is nothing left of the hinges and it doesn't restrict and access to underhood.
The heater box weighs a ton... not to mention the liquid in it.
The beauty of the pin on's though is they don't have a ton of extra bracing in them like the bolt on hoods do. One thing I was thinking of though since my bolt on hood has two hood pins at the front is removing the front latch mechanism and support assembly. That ought to shed some weight, although Im not sure if its a good idea since the hood could fly up? Or are the 2 pins enough to keep it down ya think?
As for the heater box assembly, it would be interesting to see what it actually weighs...im sure someone has weighed it.