There's a stabilizer underneath all that stuff.
The core with surround and wood weighed in at 2.02 oz; plus glue it was 2.68 oz. Given what happened with the elevators I expect that to drop to about 2.4 oz. Not wonderful, but it's not far from what I would have gotten with the kit wood, and it should be stiffer and finish out easier.
A stab that weighs 2.4 ounces sounds porky to me. Bad place for excess weight. I am on the Pacific coast camping currently, so I do not have my weights handy (they are all recorded, wink wink Howard), but I will chime in next Tuesday. My guess is that it should be more like an ounce less than what you have.