I choosed a round port.
the foam in the button as been installed in the assembling process actualy.
I made all the holes today, started to sand the veneer. Tomorow I will round the edges, continue the sanding to 400 and apply my first layer of eurethane gel.
The cabinets are made of 3/4 baltic birch, the veneer is 2.5mm thick solide african mahogany (acajou) and an insert of 2.5mm thick teck wood in the center.
I plan to use a marble or granit top plate and will forget about the round shape for the front grill as I never use the one on my other speakers.
Here are some pictures of the process, I'll take some other tomorow.