Help with Demolisher modding

Hi, I have demolisher( even though I wanted a stryfe) and I am looking on help on how to mod it. I started modding it and I have cut of the barrel attachment point, sawed of the launcher and fixed the wiring a bit, not a rewrite just made it a bit stronger. I'm planning to change the barrel to a pvc pipe so it doesn't have riffling. Sorry I am a bit of a noob but I do know how to use tools and stuff. Thanks