I'm all right Dykio,
thank you for asking and sorry to be late, I have to take care of some old relatives because of the Covid crisis, but I still have time to work on my project. God wouldn't kill me when working on one of his cathedral !
More work has been done !
I've covered those onion shape with 2 layers of epoxy resin, but only on parts that will be left uncovered.
Then I started small details with white PVC sheet (0,5mm thick), followed by some others details with putty (green Milliput) shaped with a modeler knife.
the orthodox cross are made of plexiglass (2mm thick), glued with Superglue.
Same material for the second dome, I started with PVC, followed by milliput for the upper part (because it was more easy to combine 2 materials for a satisfying result). And the tip of the dome is adapted with white putty (for car body).
The smaller dome will be painted plain green, no details on it. the small sphere on each one is a plexiglass drilled ball.