Electrical BOS components included in the PPA model

I am modelling a 35 MW AC PV plant using the single-owner PPA model. I am trying to use the relative values from the NREL PV + Storage Cost Benchmark Q1 2021 (Table 3 and Figure 11) to populate the Installation Costs in SAM for a system in South Africa.  I need to include the costs for the new substation and transmission line needed to make the interconnection to a nearby transmission line. If I use the 0.09 cents for Electrical BOS  in SAM (taken from Figure 11 for 50 MW single-axis tracker), can I assume that includes the average price for the substation and interconnection hardware + installation? Or rather should I include this additional cost as part of the 'grid interconnection' input under the indirect costs? Is this input meant to reflect the cost of the interconnection only, exclusive of the necessary hardware? 

I don't see any other place to include the hardware cost of a substation explicitly in the SAM model. The details in Table 3 of the cost benchmark report don't clearly list the transformers, feeders, or control room needed for the substation. I want to avoid double counting the cost of the substation in the model. This may be a better question for the authors of the benchmark study.