The construction tree skills allow players to craft "blueprints" of buildings (requiring some kind of materials).
The blueprints can be used by ANY player to place down buildings, no skill required to place them down, just to craft the blueprints.
Validates further the builder as a profession, giving them a product to craft and sell, further diversifying the market.
Gives players more power over their destiny - if they don't have a builder or don't want to specialize into building they don't have to, they can just purchase blueprints.
Thought it was a cool idea, lemme know what you people think.