1. A method of processing and displaying database objects to build a composite coverage structure, including: providing a canvas structure that comprises a tower attachment area and a surplus area, wherein the tower attachment area is bounded by an upper tower boundary specified as a tower exhaustion point, which is a sum of a tower limit and a tower retention, a lower tower boundary specified as a tower attachment point, which is equal to the tower retention, and a tower share boundary specified in a range of 5 to 100 percent; providing a plurality of coverage frame objects, wherein each of the coverage frame objects: represents a request for coverage proposal or a coverage proposal available to be bound as an insurance policy or risk transfer instrument; has an extent defined by an upper frame boundary specified as a coverage exhaustion point, a lower frame boundary specified as a coverage attachment point and a frame share boundary; and is selectably positioned on the canvas structure in one of a group of positions consisting of within the tower attachment area, straddling the tower share boundary, and in the surplus area outside the tower attachment area; receiving data at a processor representing assignment of a first coverage frame object to the tower attachment area and assigning the first coverage frame object to a first position within the tower attachment area; receiving data at the processor representing assignment of a second coverage frame object to the surplus area and assigning the second coverage frame object to the surplus area; and transmitting graphic user interface (abbreviated GUI) data for display representing at least: the canvas structure including the tower attachment area; the first coverage frame object automatically positioned and scaled within the tower attachment area based on a relationship of the upper frame boundary and the lower frame boundary to the upper tower boundary and the lower tower boundary; and the second coverage frame object positioned outside the tower attachment area.