Could someone please give some hints for modeling this?

[theycallmevirgo]

Mostly academic, since the solidworks model they supply imports without error. But I can't begin to understand how they did it, short of some clever subtractions. 

https://us.tchweb.com/collections/all/products/502-1346800

[A.Acheson]

For anyone  coming along to this another duplicate post with the same topic was opened here

[chris · Accepted solution]

@theycallmevirgo  apply the same techniques from this video with the addition of a couple of ball sizes and the pushed-out fillets at the corner edges

[theycallmevirgo]

I don't know why, but it was originally flagged as Spam.