This is fabulous! So what if the voice isn't 'accurate'? Neither is Abridged Nappa, but people LOVE him! (Vegeta sounded pretty close, I'll admit.)
It's clear you enjoyed doing this, I can hear the smile in your voices.
I've loved this clip for YEARS and still listen to it sometimes to brighten my day.
Don't let anyone discourage you from what you want to do! Practice makes perfect.
Besides, it's not the ability to copy voices that's important, it's the ability to ACT. It's called Voice ACTING for a reason, and you're doing just fine.
Vic Mignogna is a great actor, but can only do HIS voice when he does a role. And he's still loved.
Go for it, Nick! *cheers*