Arduino mega holder / mounting plate

I created this model to mount my arduino upside down to bottom of a railway set. I didn't have any offset screws but I had threaded inserts with bolts. These can be pushed in with a solder iron. If you're feeling lucky, you could also use some tiny screws without inserts.

There are several mounting holes inside and outside of the plate (so you can mount it with arduino already bolted in)

Recomended threaded insert: 2,5x5mm
Recomended bolt: 2,5x3-5mm