I hope you're only kidding. Don't ever give up just because someone else has something better. That's how you learn man. Finish what you started, you'll be glad you did.
I'll second that. My first over-the-top costume project was a set of stormtrooper armor. After seven months of constant toil, here's what I came up with:
Even at the time, I could pick out tons of things that were wrong with it. In hindsight, I could've had a full suit mailed to me from ebay for less than $1k and all I would've had to do was rivet it together and paint it for Halloween. Looking at my work in progress and comparing it to the
Total Perspective Vortex that is the internet, I was often tempted to can the whole project, spend less time and more money, and walk away with a shiny new costume and not much else.
Instead, I powered through knowing that I wasn't doing the greatest job in the world because I knew it would mean learning a set of skills and gaining experience with new tools and materials. That would allow me to do better work in the future.
You've got a great start going. The back piece is by far the most complex part of this build. With a bit of fiberglass reinforcement and bondo, yours will be a great finished piece. Then it's all downhill from there.
Thus endeth the sermon.
That said, if you want to just get a shiny new costume that you'll just have to rivet together and paint for less than $1k, shoot me an email.