diff --git a/sbc_case_builder.cfg b/sbc_case_builder.cfg
index 3a97f8e..0f531f6 100644
--- a/sbc_case_builder.cfg
+++ b/sbc_case_builder.cfg
@@ -38,7 +38,7 @@
     corner of component or opening, holes measured to center. All measurements in mm. 
     PCB orientation is long side of board along the x axis.
     
-    SBC: "c1+","c2","c4","xu4","xu4q","mc1","hc1","n1","n2","n2+",m1,"h2",hc4,rockpro64,jetsonnano
+    SBC: "c1+","c2","c4","xu4","xu4q","mc1","hc1","n1","n2","n2+","m1","h2","hc4","rockpro64","jetsonnano"
     
     schema:
     "case_name","sbc_model","case_design","case_style",
diff --git a/sbc_case_builder.json b/sbc_case_builder.json
new file mode 100644
index 0000000..5fc8e76
--- /dev/null
+++ b/sbc_case_builder.json
@@ -0,0 +1,54 @@
+{
+    "parameterSets": {
+        "c4_shell": {
+            "$fn": "90",
+            "adjust": "0.01",
+            "bottom_ext_standoff": "[6.75, 5, 3.6, 10, 4, 1, 0, 0, 0, 4.5, 5.1]",
+            "bottom_standoff": "[6.75, 8, 3.6, 10, 4, 1, 0, 0, 0, 4.5, 5.1]",
+            "c_fillet": "3",
+            "case_design": "shell",
+            "case_ext_standoffs": "false",
+            "case_ffn": "90",
+            "case_fn": "360",
+            "case_name": "c4_shell",
+            "case_offset_bz": "0",
+            "case_offset_tz": "0",
+            "case_offset_x": "0",
+            "case_offset_y": "0",
+            "case_style": "none",
+            "cooling": "fan",
+            "exhaust_vents": "vent",
+            "fillet": "0",
+            "floorthick": "2",
+            "gap": "1",
+            "gpio_opening": "none",
+            "highlight": "false",
+            "indents": "true",
+            "lip": "5",
+            "lower_bottom": "0",
+            "mode": "none",
+            "move_front": "0",
+            "move_leftside": "0",
+            "move_rear": "0",
+            "move_rightside": "0",
+            "pcb_loc_x": "0",
+            "pcb_loc_y": "0",
+            "pcb_loc_z": "0",
+            "raise_top": "0",
+            "sata_punchout": "false",
+            "sbc_bottom_standoffs": "true",
+            "sbc_model": "c4",
+            "sbc_off": "false",
+            "sbc_top_standoffs": "true",
+            "sidethick": "2",
+            "sidewall_support": "true",
+            "tol": "0.25",
+            "top_ext_standoff": "[6.75, 18, 2.5, 10, 4, 4, 0, 1, 0, 4.5, 5.1]",
+            "top_standoff": "[6.75, 18, 2.5, 10, 4, 4, 0, 1, 0, 4.5, 5.1]",
+            "view": "model",
+            "vu_rotation": "[15, 0, 0]",
+            "wallthick": "2"
+        }
+    },
+    "fileFormatVersion": "1"
+}
diff --git a/sbc_case_builder.scad b/sbc_case_builder.scad
index a348637..e0e32ac 100644
--- a/sbc_case_builder.scad
+++ b/sbc_case_builder.scad
@@ -53,17 +53,17 @@ highlight = false;
 // sbc off in model view (true or false)
 sbc_off = false;
 // raises top mm in model view or < 0 = off
-raise_top = 0;
+raise_top = 0; // [-1:100]
 // lowers bottom mm in model view or < 0 = off
-lower_bottom = 0;
+lower_bottom = 0; // [-1:100]
 // move left side mm in model view or < 0 = off
-move_leftside = 0;
+move_leftside = 0; // [-1:100]
 // move right side mm in model view or < 0 = off
-move_rightside = 0;
+move_rightside = 0; // [-1:100]
 // move front mm in model view or < 0 = off
-move_front = 0;
+move_front = 0; // [-1:100]
 // move rear mm in model view or < 0 = off
-move_rear = 0;
+move_rear = 0; // [-1:100]
 
 /* [Case Adjustments] */
 // base case design
@@ -71,34 +71,34 @@ case_design = "shell"; // ["shell","panel","stacked","tray","round","hex","snap"
 // base case style
 case_style = "none"; // ["none","vu5","vu7","sides"]
 // single board computer model
-sbc_model = "c4"; // ["c1+","c2","c4","hc4","xu4","xu4q","mc1","hc1","n1","n2","n2+","h2"]
+sbc_model = "c4"; // ["c1+","c2","c4","xu4","xu4q","mc1","hc1","hc4","n1","n2","n2+","h2","rpi3b+","a64","rock64","rockpro64","atomicpi","jetsonnano","show2"]
 
 // sbc location x axis
-pcb_loc_x = 0;
+pcb_loc_x = 0; //[0:.5:200]
 // sbc location y axis
-pcb_loc_y = 0;
+pcb_loc_y = 0; //[0:.5:200]
 // sbc location z axis
-pcb_loc_z = 0;
+pcb_loc_z = 0; //[0:.25:50]
 // additional x axis case size
-case_offset_x = 0;
+case_offset_x = 0; //[0:.5:200]
 // additional y axis case size
-case_offset_y = 0;
+case_offset_y = 0; //[0:.5:200]
 // additional z axis case bottom size
-case_offset_tz = 0;
+case_offset_tz = 0; //[0:.5:50]
 // additional z axis case top size
-case_offset_bz = 0;
+case_offset_bz = 0; //[0:.5:50]
 // case wall thickness
-wallthick = 2;
+wallthick = 2; //[1:.5:5]
 // case floor thickness
-floorthick = 2;
+floorthick = 2; //[1:.5:5]
 // case side thickness
-sidethick = 2;
+sidethick = 2; //[1:.5:5]
 // distance between pcb and case
-gap = 1;
+gap = 1; //[.5:.5:5]
 // corner fillets
-c_fillet = 3;
+c_fillet = 3; //[0:.5:9]
 // edge fillets
-fillet = 0;
+fillet = 0; //[0:.5:6]
 // enable indentations around io openings
 indents = true;
 // enable wall support for standoffs