More work on the control linkage of the butterfly valves:

Cutting out the clevis forks.

Turning clevis collar and pushrod end piece.

Part installed on 1.2mm brass rod,torque tube arm test fitted.

Two complete pushrods.

Installed & primed.

Butterfly valve closeup,the center muffler is slightly askew,but not readily visible.

Bellcrank closeup.

Another overall view.The planks on the transom are also barely visible,exactely the effect I was after.