diff --git a/src/cases.js b/src/cases.js
new file mode 100644
index 0000000..db6caa2
--- /dev/null
+++ b/src/cases.js
@@ -0,0 +1,75 @@
+const m = require('makerjs')
+const u = require('./utils')
+const a = require('./assert')
+
+const Point = require('./point')
+
+const makerjs2jscad = exports._makerjs2jscad = (model, resolution = 32) => {
+    const commands = []
+    m.model.walk(model, {
+        onPath: wp => {
+            const p = wp.pathContext
+            switch (p.type) {
+                case 'line':
+                    commands.push(`new CSG.Path2D([ ${p.origin}, ${p.end} ]);`)
+                    break
+                case 'arc':
+                    const angle_start = p.startAngle > p.endAngle ? p.startAngle - 360 : p.startAngle
+                    commands.push(`CSG.Path2D.arc({
+                        center: ${p.origin},
+                        radius: ${p.radius},
+                        startangle: ${angle_start},
+                        endangle: ${p.endAngle},
+                        resolution: ${resolution}
+                    });`)
+                    break
+                case 'circle':
+                    commands.push(`CSG.Path2D.arc({
+                        center: ${p.origin},
+                        radius: ${p.radius},
+                        startangle: 0,
+                        endangle: 360,
+                        resolution: ${resolution}
+                    });`)
+                    break
+                default:
+                    throw new Error(`Can't convert path type "${p.type}" to jscad!`)
+            }
+        }
+    })
+    return commands
+}
+
+
+exports.parse = (config, points, outlines) => {
+
+    const cases = a.sane(config, 'cases', 'object')
+    const results = {}
+
+    for (const [case_name, case_config] of Object.entries(cases)) {
+
+        // config sanitization
+        parts = a.sane(case_config, `cases.${case_name}`, 'array')
+
+        let part_index = 0
+        for (const part of parts) {
+            const part_name = `cases.${case_name}[${++part_index}]`
+            a.detect_unexpected(part, part_name, ['outline', 'extrude', 'shift', 'rotate', 'operation'])
+            const outline = outlines[part.outline]
+            a.assert(outline, `Field ${part_name}.outline does not name a valid outline!`)
+            const extrude = a.sane(part.extrude || 1, `${part_name}.extrude`, 'number')
+            const shift = a.numarr(part.shift || [0, 0, 0], `${part_name}.shift`, 3)
+            const rotate = a.numarr(part.rotate || [0, 0, 0], `${part_name}.rotate`, 3)
+            const operation = a.in(part.operation || 'add', `${part_name}.operation`, ['add', 'subtract', 'intersect', 'stack'])
+
+            let op = u.union
+            if (operation == 'subtract') op = u.subtract
+            else if (operation == 'intersect') op = u.intersect
+            else if (operation == 'stack') op = u.stack
+
+
+        }
+    }
+
+    return results
+}
\ No newline at end of file
diff --git a/src/pcbs.js b/src/pcbs.js
index c3a547a..93b19c5 100644
--- a/src/pcbs.js
+++ b/src/pcbs.js
@@ -206,20 +206,20 @@ const footprint = exports._footprint = (config, name, points, point, net_indexer
 
 exports.parse = (config, points, outlines) => {
 
-    const pcbs = a.sane(config, 'pcb', 'object')
+    const pcbs = a.sane(config, 'pcbs', 'object')
     const results = {}
 
     for (const [pcb_name, pcb_config] of Object.entries(pcbs)) {
 
         // config sanitization
-        a.detect_unexpected(pcb_config, `pcb.${pcb_name}`, ['outlines', 'footprints'])
+        a.detect_unexpected(pcb_config, `pcbs.${pcb_name}`, ['outlines', 'footprints'])
 
         // outline conversion
-        const config_outlines = a.sane(pcb_config.outlines, `pcb.${pcb_name}.outlines`, 'object')
+        const config_outlines = a.sane(pcb_config.outlines, `pcbs.${pcb_name}.outlines`, 'object')
         const kicad_outlines = {}
         for (const [outline_name, outline] of Object.entries(config_outlines)) {
-            const ref = a.in(outline.outline, `pcb.${pcb_name}.outlines.${outline_name}.outline`, Object.keys(outlines))
-            const layer = a.sane(outline.layer || 'Edge.Cuts', `pcb.${pcb_name}.outlines.${outline_name}.outline`, 'string')
+            const ref = a.in(outline.outline, `pcbs.${pcb_name}.outlines.${outline_name}.outline`, Object.keys(outlines))
+            const layer = a.sane(outline.layer || 'Edge.Cuts', `pcbs.${pcb_name}.outlines.${outline_name}.outline`, 'string')
             kicad_outlines[outline_name] = makerjs2kicad(outlines[ref], layer)
         }
 
@@ -250,9 +250,9 @@ exports.parse = (config, points, outlines) => {
         }
 
         // global one-off footprints
-        const global_footprints = a.sane(pcb_config.footprints || {}, `pcb.${pcb_name}.footprints`, 'object')
+        const global_footprints = a.sane(pcb_config.footprints || {}, `pcbs.${pcb_name}.footprints`, 'object')
         for (const [gf_name, gf] of Object.entries(global_footprints)) {
-            footprints.push(footprint(gf, `pcb.${pcb_name}.footprints.${gf_name}`, points, undefined, net_indexer, component_indexer))
+            footprints.push(footprint(gf, `pcbs.${pcb_name}.footprints.${gf_name}`, points, undefined, net_indexer, component_indexer))
         }
 
         // finalizing nets