Help me.

Im luke from indonesia.
Lately im really into drinking coffee especially espresso.
Since its expensive for me to drink espresso in a coffee shop daily, i really want to DIY my simple hand press espresso machine.

I want to use standard 58mm portafilter for the diy machine.
So i need sizing and measurement of a e61 grouphead.
I google the world but really i havent found anything helpful yet.

anyone help me please...