diff --git a/src/sandbox/component.rs b/src/sandbox/component.rs
new file mode 100644
index 0000000..1cfffc0
--- /dev/null
+++ b/src/sandbox/component.rs
@@ -0,0 +1,125 @@
+use super::ComponentBuilder;
+
+pub struct CircuitBoard {
+    color: [u8; 3],
+    width: u32,
+    height: u32,
+}
+
+impl CircuitBoard {
+    pub fn new() -> Self {
+        Self {
+            color: [0x78, 0x78, 0x78],
+            width: 1,
+            height: 1,
+        }
+    }
+
+    pub fn width(self, width: u32) -> Self {
+        assert!(width > 0);
+        Self { width, ..self }
+    }
+
+    pub fn height(self, height: u32) -> Self {
+        assert!(height > 0);
+        Self { height, ..self }
+    }
+
+    pub fn color(self, color: [u8; 3]) -> Self {
+        Self { color, ..self }
+    }
+
+    pub fn build(self) -> ComponentBuilder<'static> {
+        ComponentBuilder::new("MHG.CircuitBoard").custom_data(self.custom_data())
+    }
+
+    fn custom_data(&self) -> Option<Vec<u8>> {
+        let mut bytes = Vec::with_capacity(11);
+        bytes.extend(self.color);
+        bytes.extend(self.width.to_le_bytes());
+        bytes.extend(self.height.to_le_bytes());
+        Some(bytes)
+    }
+}
+
+impl From<CircuitBoard> for ComponentBuilder<'static> {
+    fn from(board: CircuitBoard) -> Self {
+        board.build()
+    }
+}
+
+pub struct Delayer {
+    delay: u32,
+    timer: u32,
+}
+
+impl Delayer {
+    pub fn new() -> Self {
+        Self { delay: 2, timer: 0 }
+    }
+
+    pub fn delay(self, delay: u32) -> Self {
+        Self { delay, ..self }
+    }
+
+    pub fn timer(self, timer: u32) -> Self {
+        Self { timer, ..self }
+    }
+
+    pub fn build(self) -> ComponentBuilder<'static> {
+        let mut custom_data = Vec::with_capacity(8);
+        custom_data.extend(self.timer.to_le_bytes());
+        custom_data.extend(self.delay.to_le_bytes());
+
+        ComponentBuilder::new("MHG.Delayer")
+            .num_inputs(1)
+            .num_outputs(1)
+            .custom_data(Some(custom_data))
+    }
+}
+
+impl From<Delayer> for ComponentBuilder<'static> {
+    fn from(delayer: Delayer) -> Self {
+        delayer.build()
+    }
+}
+
+pub struct ChubbySocket {
+    _private: (),
+}
+
+impl ChubbySocket {
+    pub fn new() -> Self {
+        Self { _private: () }
+    }
+
+    pub fn build(self) -> ComponentBuilder<'static> {
+        ComponentBuilder::new("MHG.ChubbySocket").num_inputs(1)
+    }
+}
+
+impl From<ChubbySocket> for ComponentBuilder<'static> {
+    fn from(chubby_socket: ChubbySocket) -> Self {
+        chubby_socket.build()
+    }
+}
+
+pub struct Peg {
+    _private: (),
+}
+
+impl Peg {
+    pub fn new() -> Self {
+        Self { _private: () }
+    }
+
+    pub fn build(self) -> ComponentBuilder<'static> {
+        ComponentBuilder::new("MHG.Peg").num_inputs(1)
+    }
+}
+
+impl From<Peg> for ComponentBuilder<'static> {
+    fn from(peg: Peg) -> Self {
+        peg.build()
+    }
+}
diff --git a/src/sandbox/mod.rs b/src/sandbox/mod.rs
index be458c3..1cccd1d 100644
--- a/src/sandbox/mod.rs
+++ b/src/sandbox/mod.rs
@@ -1,5 +1,6 @@
 //! High-level API for constructing and modifying a "Sandbox" / World.
 
+pub mod component;
 mod serialize;
 
 use bitvec::vec::BitVec;