How to Make Upgrade for Assets ?

Hello Unity,
How to manage upgrades ?
Example: I have a house or a gun to upgrade, I have to make a change in the geometry as well as the stats. Each upgrade level I have to tweak the geometry little bit or maybe model some small components. At every level the asset will be different, how I add the components and their textures to the original model as upgrades to the game.
This is an example link: http://clashofclans.wikia.com/wiki/Town_Hall
All help will be much appreciated!

 

bump

 

This is not a topic for the discussion section, but better placed in Scripting.

Easiest solution to your question: make a prefab for each level and switch them (instantiate new, destroy old) based on user input. How you are doing this would depend on your UI.

 

Thank you Baroni!
I got your point