As I mentioned, the tender side sills were looking a little barren. So, I scurried over to the reference material to see what should be there. Interestingly, this is a point where 622 differs from its stable-mates. The details were straightforward to put together with strips of brass and some Grandt Line nut-bolt-washer castings.
Now to put 622 back together and see if she still runs before painting!