It is impossible to change the weight of anything in oblivion.
you go to falconreech and go into the weopon shop and make your own weopon
Triton
No, that is a PC only feature.
construction set
if youre asking if you can make your guy fat, no.
The Fist
Yes, though occasionally the character travels to the Realm of Oblivion, and once to Henantier's Dream World.
its a aztec weopon
Varies by jurisdiction.
the tes4 construction set is not included in The Elder Scrolls 4: Oblivion game of the year edition but you can download it from: http://www.elderscrolls.com/downloads/updates_utilities.htm
yup, but you wont have any textures/models/objects/scripts or events, you have to make em
The Kvatch Rebuilt mod can be found at the Oblivion Nexus.