I built a crossbar and welded two short tubes to them for the idler arm pivot bolt.  Then it was reinforced with a piece of angle and a thickening plate for the adjusting bolt.

The tension for the idler arm is from a bolt through the two plates pointing to the rear.  When the bolt is tightened the arm swings back tightening the fan belt.

I finally got the new stand/guard installed! I have the fan centered and most of the stand's mounting bolts installed. Next comes the engine. She's also getting a fresh paint job too!

This is looking down on the whole drive system assembly.  The sprocket on the left side of the shaft is half of the prop mounting hub system.

Looking from the starboard side. The two forward vertical tubes support the drive shaft bearing and radiator brackets.  The drive sprocket is as close to the stand as I can get it.

Looking forward.  The fan belt easily clears under the radiator.  The Idler pulleys are attached to a vertical pivot bar and swing tothe rear for tensioning.

From left to right:
prop hub mounting sprocket, rear bearing, fan drive pulley, forward bearing & prop shaft driven sprocket.

Well, I discovered another "little" problem today.  The chain is just a bit too close to the radiator hose.  I am building a crossbar with a plate that will fit between the chain and the hose.

The basic box has been hot glued together.  I will try rounding off some of the corners for better looks.  It appears as though the fan and radiator will both be able to get plenty of air.