Just a few thoughts on your pseudo-code:

my $chunks = $length/ #divided by how ever many chunks you want

This would seem to give you a chunk length rather than a number of chunks, but you are subsequently iterating over  $chunks as if it were a number of chunks.

foreach (0 .. $chunks){
    ...
}

This gives an off-by-one error if  $chunks is the number of chunks over which you want to iterate. Either
    foreach (0 .. $chunks - 1) { ... }
or
    foreach (1 .. $chunks) { ... }
would seem to do a better job (if knowing the chunk index is not an issue).