I was able to secure the drive sprocket today with so many mods, due to lack of materials, I had to use an airsoft inner barrel as sleeve to couple the drive sprocket into the drive shaft.
In between the drive shaft and the drive sprocket is a silicone tube to act as slipper incase of weight over load, it has been forced-fit but not to tight.
Drive sprocket to track is the main problem, since there are no cogs on the drive sprocket and the tracks are made of rubber, the sprocket slips off during heavy load or action, often during turning where there is difference in track speed.
Here is a test run video:
As you can see, forward and backward drives are not a problem. but turning is a bit of a challenge (see 0:28) the traction of the rubber tracks adds resistance.
Next up? Blade elevation...