Angel, as always i love the idea of the smaller one.
Looking like it´s name could be miniblock
With 10mm tubes you might think also for the Flyduino X2208, i use them on my 1100g FPV ship, they run so smooth you wont believe but also very powerfull and light.
I use them with 9x4.5 eProp style propellers and 4s.
Also a very good idea to base on some centerplates that are already aviable to buy somewere and not to search for someone to machine them! Thumbs up.