Unimog 404 Om617a engine mount

[Etzicle]

Can anybody advise on making an engine mount to put an Om617a into a Unimog 404? This pic of someone else's custom mount and is all I'm working off of and I can't get ahold of them.

My main question is if the engine is really only mounted from the front drivers side corner? Or is there more not pictured? He's using the bolt holes from where the a/c compressor is supposed to go plus two more holes he drilled.

Oh, and that's my other issue. I started to drill the hole right below the vacuum pump and I popped into some cavity in the engine. I have no clue if that's an issue now. That's the other two pics. Please advise.

I'm in over my head, don't really know what's going on and am on a time crunch to get this Unimog running and on the road. Any and all help is appreciated, thanks a lot guys!