Questions on using a moving gantry style mini-mill...

[JAZZCNC]

Dave this what I meant when said Aluminium bed is Ok but often you'll have Spoil board on it. So here's what I would do.
Fit spoil board that can be screwed into and surface it. Then I would change the Code and move the smaller part in wards and drill holes put screws where I have black circles on your last pick.

Then onion skin the both parts with about 0.3mm. Doesn't matter the large part will not be held down one side the rest will old it.

The skin then just breaks away and quick cleanup with De-burr sorts what's left.

I do this type thing all the time in shity 1050 2mm plate and works perfectly.