Didn’t what he give you include visible ports on both sides?
What I am talking about is what is shown in most of the examples that use “Table” Panels. Each row of the table is implemented as a “TableRow” Panel, where each of its elements has a different value for column:. The port on the left would be in column 0 and the port on the right would be in column N-1, where N seems to be 4 in your case.
For example, the Record Mapper sample, Record Mapper, does this, except that it doesn’t have separate left and right ports – it uses the whole row as a single port. Still, the itemTemplate (named fieldTemplate) demonstrates what I mean about using a “TableRow” Panel.