This build went pretty easy, currently took about 3 hours to cut the barrel, mount the front sight, and install the parts. Here are some of the pics in progress.
I'm finding center on the outer barrel by using the front sight and the top rail.
Now I've plotted out where the pump grip sits, inner barrels are, and where the front sight goes. After a few more measurements I decided to place the front sight in a different location.
After deciding to move the front sight farther back, I marked out the final length of the outer barrel and used a pipe cutter to remove it. I cut a smaller portion off the top to practice first.
Now I'm remounting the front sight which had to pins and a screw attaching it to the front barrel.
Mounted and ready for the dovetail sight to back on.
Making sure the sights are lined up.
Still have a few more things to do like paint the front edge of the barrel, try and make the lighted grip less wobbly, and maybe a mod to the front sight.