Known Bugs

There are tracks with links either 1/2" and 3/8". One track piece gets stuck some times. Need to grind drive cog to more taper of teeth. -7/29/15
Track sections are difficult to weld. Flat bars can't be used, as a part of the links needs to have a standoff
Machine height of 58" is too tall - and appears to be not marketable as far as a consumer good

Good Points

Success metric - machine spins 360 degrees in place as expected.
Torque of 7500 lb at 2 tracks is significantly stronger than industry standards.
DIY build suggessful - track sections build with cutting, hole punching, and welding jigs.
Pipe wrench bending of idler shape works on 1/4" steel plate
Tensioner works as expected.
A 1" pin on track sections - if we compare that to 3" cylinders where a 1" pin holds 20,000 lb - is sufficiently robust to hold 6000 lb force with a safety factor of 3
Actual pin requirement is only 2000 lb for pin bending with single cog drive because 3 teeth catch the chain at all times.