I'll be selling my completely painted,and finished ESB "MB" gauntlets in the near future if that helps. 
I did however use extra styrene to make the whipcord housing,assuming that's the part you mean,wider.I used a BIC pen tube as the inner piece,and it all worked out fine.Using #16 acrylic glue helps as it "meld" the plastic making it super strong.I then bondo'd,and primed 'til a nice smooth surface was attained.Hope this helps.
Steve