Arrange:

1. construct, put together, erect, set up, fit or join or piece together, connect, fabricate, manufacture, make.

Assemble:

1. gather together; collect.
2. arrange in order.
3. fit together the parts.

Assemblage:

1. the act or an instance of bringing or coming together.
2. a collection of things or gathering of people.
3. the act or instance of fitting together.
4. an object made of pieces fitting together.
5. a work of art made by grouping found or unrelated objects.