That might have been me who made the weights ? I did some for a few people, unfortunately it was far too time consuming as I was custom making them for different cars, ultimately I couldnt make them for everyone who asked which made me feel bad
On the point of weights and using them to locate the Lipo's, it wont be as pretty but some lead sheet cut to the size of the cell slots and stuck to the lipos would do the job. Unless that sexy b44 brass lipo cradle can be made to fit ?