I am currently using Chess::PGN::Parse and have had no issues with it at all. I definately suggest it over attempting to write your own.
If you are just writing your own version for fun, practice, or to learn something new, I'd say, "Great! Go for it!" Just don't release it to the CPAN unless you are adding a lot of new functionality or there is a speed improvement. If you have questions on releasing it or not, the authors of the other chess modules are here, and I'm sure they'd be glad chat about chess and Perl.