Column types and development of plan

The columns have been categorized and separated into two parts, the pin head and the drop column creating the pin-drop. They are sub-headed depending on structural complexity:

. Structural elements:

            -Pin-Drop

            -Pin-Drop (rib)

            -Pin-Drop length/height

            -Pin-Drop radius

            -Pin-Drop merged

            -Multi Pin-Drop

            -Pin multi-drop (rib)

            -Multi-pin, Multi-drop (rib)