Playmobil Battery holder for Toy Train

A friend of mine wanted to have a new battery for their Playmobil Toy Train. Since the original battery module also just used 4xAA batteries in series, i thought it would be nice if one just could swap the batteries.
I used a standard battery holder and grinded away the original contacts and spot welded on a piece of nickel sheet. Then the 3d printed parts can be attached with some glue.

Thanks to Hemigramus for the original design.