Process Portal is already available as a Process App and you can add yourself as a admin to it, but all the artifacts of the Process Portal are not available it only a Resource Bundle is available which can be used to customize locales and Messages on Process Portal.
In the LSW_PROJECT table there is a IS_HIDDEN column which hides one Process App namely "Ad-hoc Reports" with the acronym "ADHOC" and then able to access the Reporting resources inside it. But please check licensing terms before replicating them , I guess learning how adhoc reports are built is ok though.