OK, so I don't have pictures yet...
But! Use your imagination for now. The long seat is still on. I really want to use it and make it look nice. I think I may have figured it out.
Look at this picture (for reference only).
The bags that I had on it there are back on. I have them sandwiched between the seat and the seat's frame. I also put a piece of stainless steel sheet behind them for support (which is fully hidden). The battery is in the right bag, and the lights are mounted at the back of the seat.
It looks much better now. Pictures tomorrow.