Basically the same way,
I fit the skin with a small frame around its edge, mount that to the hinges, as in left pic.(old mini hinges worked perfectly for this one)
That way I know everything lines up, & the door doesnt catch when swinging open.
Retrofit the latch to make sure it doesnt catch, then weld the supporting inner frame with everything in place, & checking clearance wile sitting in the car, theres not a lot of space in the Maserati.
That way I can see straight away if i'm having any clearance problems as i'm going along.
Then just skin the inner frame.
So its the same way you do it, I just start with skin first.