Are those sprung/suspended wheels on A-frames, or fixed wheels?
Are those direct driving motors or un-motored?
Is there Ackerman steering?
The pictures (even when clicking) are too low resolution to really see well. Are there higher-resolution pictures somewhere?
(I found a video on Vimeo that seems to answer these questions:
- Fixed frame wheels
- Direct driven wheels
- Fixed/Tank steering)
This makes it a little less interesting to me, as drilling holes in aluminum profile isn't that hard. Having built some myself, making sprung/suspended wheels with direct drive and real steering is quite a challenge!