For purposes of the Seed Eco-Home, it is important to automate BOM generation so that lengths can be summed up automatically.
v1- name parts in part tree, print out a spreadsheet of parts. Then summing them is trivial, either by hand or a spreadsheet summation. Simply renaming parts gets you to a spreadsheet. Word count summation can get you to automate the counting, instead of using spreadsheets. The simplest way is - part name and length - then simply sum the lengths required.
v2 - drag and drop part library parts with properties, with script for automated output of members (cut list) and overall length (BOM purchasing purposes)