Is there a question? Did you meant to post pictures so we could see your project?
I'm going to answer what I think you may be asking which is where to find pieces to fix it up and/or what to look for. Many of the SBE2 parts will fit on the SBE1. I know with 100% certainty that the forearm from the SBE2 works with the SBE1, and I am ~95% sure the buttstock does as well. If you swap out the forearm, it would also allow you to swap out the barrel to a later SBE2 high rib type with the later Crio chokes. Some prefer the low rib, some prefer the high rib. But, by the time you refinish the original, and especially replace missing chokes, possibly clean threads, fix dents, etc. it will likely pass the cost of a new SBE2 replacement barrel. On the SBE, the top half of the receiver is the barrel. So, by replacing the forearm, buttstock, and the barrel, you've swapped out most of the stuff viewable from the outside. If the lower receiver and trigger guard assembly is in good shape, or can be refinished, you should have it looking new.
While you have the buttstock off, it is a good time to check the recoil spring assembly. These can get rusty if not treated right and/or jammed with crud which can cause feeding issues. The bolts on these are generally solid so a quick cursory cleaning should likely be all is needed there. Shine a light down the mag tube when you have it disassembled and see if it looks clean and shiny. If not, pull the mag spring and give it a good cleaning. Only use DRY lube in the mag tube. Otherwise, it will pick up dust and dirt off the shells you put in it when you start using it and it will gunk up fairly quickly. I've bought a lot of semi-auto's that the owners were sick of because they jammed all the time and almost invariably, the problem was wet lube in the mag tube.