Here we see the upper deck's dual-sided motherboard; and clean welding seams in its cover to explain how the Block so neatly bypasses visible fasteners. Also note the square shafts for the controls which avoid possible slippage when a lock screw loosens.

Here is a look at the board's capacitor alley on the other side.

This closeup reveals some intricate metal work encasing the three main controls...

... this one proper through-hole mounting of PCB parts.