case-41: bullet: build a stacking demo, first steps
case-41: bullet: build a stacking demo, first steps

chbfiv/fabric-engine-old,errordeveloper/fe-devel,errordeveloper/fe-devel,errordeveloper/fe-devel,chbfiv/fabric-engine-old,errordeveloper/fe-devel,chbfiv/fabric-engine-old,chbfiv/fabric-engine-old,chbfiv/fabric-engine-old,chbfiv/fabric-engine-old,errordeveloper/fe-devel,errordeveloper/fe-devel,chbfiv/fabric-engine-old,errordeveloper/fe-devel