Cabosil is more structural than micro balloons. As it sounds, micro balloons are full of air. Good for sanding but not for thickening up a structural component like fillets, etc.
looks sharp! word of advice. on your console, I have a similar setup- using a solid piece of teak over top my whole dash. If I had mine to do over- I would move all my switches/gauges as far "up" as possible. I find my fiancé and I are constantly putting our feet on the lower edge of the dash while we are sitting at the lower console and from time to time, I have pulled the kill switch by accident or switches have big flipped and unless I am paying attention- something like a bilge pump or livewell pump will run until I notice and turn it off.