update stl build dir structure

assembly-guide/README.md

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+# Rack Assembly Instructions
+
+**Note**: This rack uses two different types of M3 flat heat screws: a 6mm length screw, referred to as type A; and a 10mm length screw, referred as type B.
+
+
+TODO: Add image reference for parts
+
+## Instructions:
+Insert heatset inserts into Y-bars - 4 times:
+![insert heatset inserts](./insertHeatsetInserts.gif)
+
+Glue magnets into magnet side-modules - 4 times:
+![glue magnets to magnet modules](./magnetToMagnetModule.gif)
+
+Glue top and bottom magnets into side walls - 2 times:
+![glue magnets to side walls](./magnetToSideWall.gif)
+
+Insert top and bottom dowel rods into side walls - 2 times:
+![insert dowels into side walls](./insertDowels.gif)
+
+Slide Y-bars into X-bars - 2 times:
+![slide y-bar into x-bar](./slideYBarIntoXBar.gif)
+
+Screw together Y-bars and X-bars using 4 B-type screws (one screw per corner) - 2 times: 
+![attach x-bar with y-bar](./screwYBarXBar.gif)
+
+Screw in the side-modules with A-type screws: two magnet side modules in front with the magnets facing outwards, and two dowel holder side modules in the back - 2 times:
+![attach side connector modules to y bars](./screwYBarSideModules.gif)
+
+Screw in the main rails with A-type screws:
+![connect xy-tray with main rails](./screwYBarMainRail.gif)
+
+
+Prop us the side wall using the side modules. Make sure the dowels are inserted properly, and the magnets align:
+![prop up side walls](./slideInSideWall.gif)
+
+Slide in the other (top) tray. Make sure the magnets and dowels align. Screw in the main rails with A-type screws:
+![attach xy-trays](./connectXYTrays.gif)
+
+Slide in hex nuts into feet - 2 times:
+![slide hex nuts into feet](./slideHexNutToFeet.gif)
+
+Insert feet into the bottom of the rack: 
+![insert feet](./slideFeetIntoYBar.gif)
+
+Screw in feet using 4 B-type screws:
+![screw feet](./screwFeetIntoYBar.gif)
+
+Finally, attach the top and bottom plates with 4 A-type screws each:
+![attach xy-plates](./screwXYPlates.gif)