Hey Matt ,
I have the RK Imperial Proto 3 B&O B6 model # 30-1570. I liked the cab roof color on the Pennsy Proto 2 model but cash flow didn't allow me to take a second B6 home. 😕
It's a hefty little thing and it has run really well for me. No problem running through 031 switches . Smokes great and good sound. It came with an engineer . I didnt see an engineer in the 30- 1170 ,but I'm sure it wouldn't take much to put one in the cab. Definitely good to see you are getting the EBL battery ready for it .
Details can be added like a real coal load or additional piping. There are different videos and images of the B6 for examples.
I imagine your B6 might be the same casting as the one I have . The MTH RK B6 is actually a " Scale " ( 1/48 ) size loco like their Premier line. Next to the other RK steamers on the layout, it does look a little large but I wouldn't give it up for anything.
Have fun and be safe Matt. 😷