First look at a rectangular slab-on-grade with slab insulation and subbase material installed.
Now I just need to jump into the polgyon module and enable the same feature for a polygon/face outlined slab-on-grade and then we can roll this new feature out.
When I get a bit more time I will also add in the volume of the subbase material (CY) into the stats tab (attribute library) which can then be picked up by the estimator module and this information will also be part of the spreadsheet (Excel/CSV) output.
Note to other developers:
As I further develop these plugins I am including a stats table in the attribute library of each assembly I create. This information is exposed and can be utilized by anyone, including other plugins. For instance for slab-on-grade foundations I provide the number of anchor bolts, the lineal feet of rebar, the area of the slab, and the volume of the concrete. If there are any questions about any of the entries in this table and what each number means I will be more than happy to dive into the details with you.