Bathroom scale? Yeah, with obvious heavy parts maybe, but not so revealing with items in the 1-10 Lbs.
The 1-10 Lbs ballpark is where most of the hard work presents itself because there's more of those fields through out the car than the bigger heavy weight items. It is also the ballpark where your kids daily allowance is a bargain compared to what is in store. Like Procharged on here said, those Ti-bolts are light on the chassis and heavy on the wallet.
I've saved for weeks to be able to buy four K member bolts that only ultimately saved 3/4 Lb. So in reality, I sacrificed a 401-K for a real K-member. LOL.

I remember using a bathroom scale back in 1990 when removing my original front and back seats. The front half fold down bench seat with belts and mounting hardware weighed exactly 100 Lbs. The rear seat and backing weighed 56 Lbs.