different between sketching vs constructing

English

sketching

sketching (plural sketchings)

Something drawn briefly and basically; a sketch.
a collection of Chinese sketchings

constructing

constructing (plural constructings)

An act of construction.
- 2002, Anne Lancashire, London Civic Theatre: City Drama and Pageantry from Roman Times to 1558
  Only the construction of wood and canvas castles, temples, and the like would require some time: and not as much as might be thought, given both London's fixed structures - such as conduits, and the Cross in Cheapside - upon which and around which structures could be erected, and London's practice in the frequent necessary constructings of such pageants.

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