A new 5 part set consisting of:
1. Under construction fence - found under Build Mode / Fences, costs 0.
2-4. Small, medium & large sand dumps - found under Decor / Misc. Decor, all costs 0.
5. An under construction sign on a metal pole - found under Decor / Misc. Decor, costs 0.
Create a hole on the ground, give it some dark texture, place the fence around it,