From this image, the attachment ring looks completely solid:

But on this drawing, one could thinks that there’re holes where you can see through:

Or are these just cavities that are hidden from the other side?
Spikeys first video snapshot from above suggests (especially the deepening at the image bottom) that there could be holes but I’m not completely sure:

Maybe, the design has changed since in Spikeys screenshot the front ring seems to be one piece with the disc below. Or is this just an illusion caused by the paint layer?
But from this section of the front axle, it seems again a continuous structure (red circle):

And the same on the rear axle:

So, I’ll keep my model as it is with some artistic freedom.