Made an account just to lend some support. Swordcraft stories is one of my favorite series on the GBA and it's a crime we never got the 3rd installation. I'm cheering you on man and eagerly await the day you are satisfied with your finished product.
I took a look at the rail and noticed that the two last pins were soldered for some reason, luckly I still had the rail of my broken joycon so after I swapped them I was able to use it attached to the console