Nice.
Never really cared for the look of sabot bases once one figure was out - though the idea was a step forward. Beware you will need to replace the blue-tac over time as it hardens up but that is a small price to pay to improve ease of moving figures on the table. Maybe you can find some gray colored tac (?) and then it will look even more like rocks when figures removed - or did you already, couldn't quite tell in the photos on your blo?.
Well done.