just did my gen 3 G19, easy to do and you did a good job. i didn't finish it to a factory finish on the groove area since i knew i was going to stipple and it didn't matter. now fits my hand perfect. i took mine off since the crimson trace add a little width and length to the handle, now it is good to go. i'm a 'dremel professional' actually a Foredom i used so i just switched to different grade sanding drums until i got it where i like it and then under cut the trigger guard to chock my grip up a little more.
once again good job!