What you have now is a base model Hasbro/Kenner E-11, should meet base approval (depending on your GML). Doopy Doo's used to make an add on kit to make it a little more accurate BUT would only clear for base and EIB levels (depending on your GML of course). Lots of different color/versions, the last of the Disney Parks E-11's had a selector switch to go from kill to stun (different lights and sounds). Majority of E-11 builds back then (13 years ago) were Hasbro or pipe builds, no 3D printers back then (ok there were but around @$2,500 and upwards
There also used to be a few others supplying resin kits back around then but unfortunately all gone now.
I used to cut off the front of the barrel, fabricate an accurate one with T-tracks so it was at least the right size and LED's could be seen through it.
My build thread is here (pre 3D file era)
And then I had to build another E-11 for centurion standards, this was a pipe build with Doopy Doo's add on's (they also did a full resin kit) and some hand made pieces. Build here
I did find some 3D files to add a little more detail to the blaster which I posted here:
There are some really great Hasbro upgrade/conversion build threads on the forum and worth having a dig through some of them, was always amazing to see how so many builds were a little different from others and quirky additions some people added
You will have no issues using Bryan's files for EIB or Centurion, he put countless hours into those files and a lot of detail work, even a working trigger for electronics. Biggest thing is not to leave any print lines, prep work is definitely the key to any printed prop, hurts my brain every time I see printed props with no sanding or filling, hey but that's just me.
Bryan has some images in this thread
Zeroroom (who I never got to meet as he retired) came up with some great templates for a scratch build E-11, I'll have to remember to upgrade his watermarked images, stupid Photobucket