Close, for the thru holes, I started with PVC pipe. Then I wrapped it with PE until its the same OD as the brass tubing ID. Cover it with shipping tape. Then just wrap it with a few layers of fiberglass cloth and epoxy it. Take your hack saw and cut it to lenght. you can't make the glass thick or it will not fit in the original opening. To install it. make some thicken epoxy (like peanut butter). you might have to drill the hole a bit larger. Make sure you let the hull dry prior to installing it. Put in the peanut butter. slide it into place. swab out the ID of the new fitting and use shipping tape to keep in place and for mold release. FYI I use shipping tape to cover the holes when I patch them as well. It makes for a much cleaner repair.
I’ll see what condition mine is in when I pull it. Patching might be the call. I get all my metal from IMS in Irvine. I have a roller that can do 2” but don’t have a bender with a die for 2” currently. That’s my next order though. Going to get a JD2 with a 2” die soonI see life is rough!
If I had welding skills and gear back when I did mine, I may have just patched her! Where do you get your materials? More important do you have a tubing bender? Something that can handle 2" AL?