The relevant weights are as follows:
Whisperlite Universal, 258g (with the liquid fuel adapter and UG/UK jet)
UC Jet = 5g
UG/UK Jet = 3g
Canister addpter = 30g
Liquid Fuel adapter = 22g
If you swap out the liquid fuel components and swap in the canister gas components, then (if I'm doing my math correctly), you'd have 268g (9.45oz) for the basic stove (without the canister stand) when configured to run on canister gas.
I wish I could tell you more about the canister stand, but, as has been pointed out, MSR neglected to send me one for review. However, as has been mentioned, you don't need the canister stand for either conventional or inverted running. A lot of us have been running remote canister stoves in inverted fashion long before the Fyrestorm or the Whisperlite Universal. I typically just lean the canister against a rock or something when I want to run in inverted mode.