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Guide to Assembling the Tamiya Double Gearbox - 344.2:1 Gear Ratio
Step 3 - Gearbox Housing

Step 5 - The Second Half

Step 4 - The Remaining Gears

If you haven't installed the brass eyelets into the chassis, do so now (see the picture). 

Locate the yellow G2 Gear and place it on the hex shaft so that the smaller gear fits against the blue G3 gear on the round shaft.

Put the outer chassis and middle chassis parts together as shown in the picture. The round and hex shafts will fit into the brass eyelets.

Once everything is lined up, the two chassis parts will fit snugly together with no gaps in the seam between the 2 parts.

Find 3 of the 18mm coarse threaded screws like the one shown in the picture.

Place the 3 screws into the holes on the outside housing as shown in the picture. There are actually 4 holes but only 3 will accept the screws. The fourth hole is under my thumb in the picture.  Tighten the screws to hold the 2 parts together. 
 
 
Step 3 - Gearbox Housing

Step 5 - The Second Half