Great work Darryl, it is fantastic to see you getting into the quantifiable side, many overlook the power. There is a new release coming out that will help you with a lot with this yet your method is great. Creating custom materials that can be quantified is great for many things. You will also find the BIM tool
invaluable for creating jobs specific items. We use it in AAD Build for adding allowances into a job, right down to drafting costs, council fees and more. It is easy and we will be refining the system in the future to allow you to automate the process.