Nice looking guitar! It looks like it was influenced by MSA and ZB Custom guitars that were made here in the USA. The changer design is unusual though… I haven’t seen one quite like that, but it looks sort of like a sideways version of the ZB changer. But it looks like you are raising strings 3, 4, 5, 6, 8, and 9 and lowering 2, 4, and 8. Thats a pretty standard setup for E9. If it stays in tune reasonably well, then you should be in good shape.
The ball and socket arrangement for attaching pedal rods is the most common way that it is done. Emmons, Lamar, and a few others do something different. The ball and rod arrangement was used in the early Sho~Bud guitars. The parts were available from automotive shops, and were typically used for carburetor linkage… Sho~Bud also used motorcycle brake pedals as the first pedals on the guitars.
The arm rest is definitely aftermarket. Personally, I’d lose it, as they can cause some bad right hand habits to develop.
Pedal steel bars are usually pretty heavy… it’s a personal choice, but I wouldn’t go too light. I have seen those two rounded end bars before… some guy in the States was making them a while ago. I can’t remember who it was though. The length looks good though, which is important.
Some steel guitars have switches and other controls, some don’t. They usually turn pickups on and off, or activate a coil tap. You’ll have to trace the wiring, to see what it is supposed to be doing.
The volume pedal looks like a pretty standard Goodrich 120 knock off. They are good pedals, and you can replace the pots when they get scratchy. You can also go crazy with active pedals from Hilton, and Telonics… I still use a Goodrich.
I play 10 string E9, 10 string C6, and 12 string Universal E9/B6. Check out the Steel Guitar Forum for lots of information
https://bb.steelguitarforum.com/index.php
Watch out, this can get as bad as modular.
I currently have 6 pedal steels… 2 Sho~Buds, 2 Emmons, a Williams, and a ZumSteel.
A couple of pics…
This is the Copedant on the U-12 guitars
EMMONS S-12 COPEDENT Sheet1.pdf (18.9 KB)