Suggestion

When the unit has already made its first extension, I have the problem of when a small amount of material falls on the current track, it prevents a new track being built. Maybe allow it to backup and dig material that lays on the last track? Right now I have an Excavator on standby to cleanup.

thanks for the report :) should be fixed in 0.8.5 - if loose stuff falls where the next track piece goes (or on the end of the last one) the excavator now digs it away itself, and backs up along its track if its too close for the boom. so no cleanup excavator needed anymore. can you test it and tell me if it works for you?