Long time lurker, first time posting.
I had the same idea, but my goal was a low-cost garden layout. I planned on using welded low-cost 1/8 steel bar instead of Lionel track, so track power wasn't an option.
Since my brother gave up on the garden, I think I'm going to build a shelf switching layout with styrene rails.
The radio control is great for operation, so Lionchief seemed about perfect. The battery came from my airsoft stuff. The only thing that needs work is the low-speed operation, but I think a second powered truck will help significantly.
https://m.youtube.com/watch?v=m_sI1nZVjZQ
Oh, I rewired the truck backward, that's why the headlight turns on against the direction of travel.