Flat hood pin on.
It's not a PITA as much as it may seem. Mine is aluminum and heavier than a glass A-team hood and I still manage to lift off and arrive back on the four pins with precision. There is simply an exercise/maneuver that makes it a breeze to lift up, swing into position and walk away. Similar moves going back on but with a touch of TLC speed to keep things from being scratched and or broken. The weight taken off the very front and high on the car is well worth it.
I agree, not bummin' on other Dusters with open air systems, but a flat hood makes for some head scratching and admiration.
Aluminum prop shaft from Dynotech or Mark Williams will be proper and right the first time around. There is still a few items on that pup that will bring your numbers back down.
Curt "Glasses" had his Duster down to high 2900 Lbs with little done.
Back seat is an option, but I'd reinstall it and look elsewhere for savings. My personal opinion of that Duster is that it should look the street car part. You could also gut it and have there for looks.
Yes, it's should be around 40-50 pounds total for the seat and back cushion.