In my $job I am constantly working with delimited records and multiple record types per transaction. If I am going to read the field data into variables, one of the most important things to me is to make the meaning or purpose of each field clear either thru variable names or the position in a data structure.

I would suggest an HoA where each record is stored as an array, keyed using the record type. There is a repeating section, 530-510-529, which could be a HoAoA.