I saved my experimental caterpillar to show some stuff to broadcast watchers... The save file doesn't load my creation but you have tilted starting block.
You will only have start block but it is tilted and when you build on it all blocks are tilted randomly... Oh boy!
OS: Windows 7 Pro 64bit SP1 CPU: 2600k @ 4.0GHz, watercooled GPU: GTX 770 4GB @ Stock, watercooled RAM: 8GB DDR3-1600MHz CL7 Game version: v0.05