It's an old work, but I went wild without any name/storyboard so it's needlessly long.
Literal
Old work [copula-ですが], storyboard without [at-で] as-I-pleased did-[regret-てしまった][reason-ので] wastefully long [copula-です].
ネーム 'name' in manga refers to the rough storyboard/layout — a manga industry term. 好き放題やってしまった 'did as I pleased (and now regret it)' — 好き放題 'doing as one likes without restraint.' 無駄に長い 'pointlessly long.' A creator's self-deprecating introduction to their own work.