tGA or others

1 - can you explain the reaosning for the chart in STU including cars such as the Audi A4, Mini Cooper S, etc... that are listed with no notes and weight per the chart? wouldn't it have been easier to leave them to the main rules as they appear to me at least to be legal basd on 9.1.4.2 in general.

2 - what does the chart mean in terms of motor swaps from those cars - particularly the group mentioned above where they appear fully legal as doner engines to a swap per the ST category rules, or those such as the 2AZ-FE + TRD supercharger from the Scion Tc which could be directly ported to a coroola / matrix / camry or easily enough to many other toyotas. how is the weight of a chart-car based swap worked out, or is it not allowed?