Great progress Andy. We have experimented with various materials for bulking out bucks. We used Builders Finish plaster mixed with grp resin to shape the panels on the Z300S buck (see WCA's build tread 3), it's only £4 per 25kg bag, you do need to shape it's whilst it's just going off otherwise it's a little hard to sand. The Drywall filler sounds like a good idea as it does sand easily.
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