The transaxle was the only part of this engine that I never cracked open so it was all new to me.  The drive shaft from the clutch goes over the axle driving part to the far end where the gears of the transmission portion are located and then power goes back towards the engine where the axle portion is located.  Here is the drive shaft going over the top of the axle portion.  You can see in most cases I used brass inserts to make assembly and disassembly easy. 

The gears in the transmission portion are printed separately and stacked.  What I found out was the friction between these parts was too great to make them turn and actually shift so these parts are realistic but not functional in that they don't turn.

There are two stacks of gears and a third reverse gear shaft.  Here you can see two of the shifter shafts.

And the reverse shifter.

These are the two gear stacks meshed together.

In the other end is the throwout bearing.

Inside the middle is the ring and piñon.  Here are the parts.