Solved the 'smaller' gates and probably not with the best solutions.

projects/01/And.hdl

@@ -15,4 +15,6 @@ CHIP And {
 
     PARTS:
     // Put your code here:
+	Nand(a=a, b=b, out=out1);
+	Nand(a=out1, b=out1, out=out);
 }

projects/01/And.out

@@ -0,0 +1,5 @@
+|   a   |   b   |  out  |
+|   0   |   0   |   0   |
+|   0   |   1   |   0   |
+|   1   |   0   |   0   |
+|   1   |   1   |   1   |

projects/01/DMux.hdl

@@ -15,4 +15,11 @@ CHIP DMux {
 
     PARTS:
     // Put your code here:
+	// AND in, sel
+	Nand(a=in, b=sel, out=out1);
+	Nand(a=out1, b=out1, out=b);
+	// NAND( (NOT sel), AND in)
+	Nand(a=sel, b=sel, out=out2);
+	Nand(a=in, b=out2, out=out3);
+	Nand(a=out3, b=out3, out=a);
 }

projects/01/DMux.out

@@ -0,0 +1,5 @@
+|  in   |  sel  |   a   |   b   |
+|   0   |   0   |   0   |   0   |
+|   0   |   1   |   0   |   0   |
+|   1   |   0   |   1   |   0   |
+|   1   |   1   |   0   |   1   |

projects/01/Mux.hdl

@@ -15,4 +15,17 @@ CHIP Mux {
 
     PARTS:
     // Put your code here:
+	Nand(a=sel, b=b, out=out1);
+	Nand(a=out1, b=out1, out=out2);
+	
+	Nand(a=sel, b=sel, out=out3);
+	Nand(a=a, b=out3, out=out4);
+	Nand(a=out4, b=out4, out=out5);
+	
+	//Nand(a=out2, b=out5, out=out);
+	//Nand(a=out6, b=out6, out=out);
+	//OR
+	Nand(a=out2, b=out2, out=out6);
+	Nand(a=out5, b=out5, out=out7);
+	Nand(a=out6, b=out7, out=out);
 }

projects/01/Mux.out

@@ -0,0 +1,9 @@
+|   a   |   b   |  sel  |  out  |
+|   0   |   0   |   0   |   0   |
+|   0   |   0   |   1   |   0   |
+|   0   |   1   |   0   |   0   |
+|   0   |   1   |   1   |   1   |
+|   1   |   0   |   0   |   1   |
+|   1   |   0   |   1   |   0   |
+|   1   |   1   |   0   |   1   |
+|   1   |   1   |   1   |   1   |

projects/01/Not.hdl

@@ -14,4 +14,5 @@ CHIP Not {
 
     PARTS:
     // Put your code here:
+	Nand(a=in, b=in, out=out);
 }

projects/01/Not.out

@@ -0,0 +1,3 @@
+|  in   |  out  |
+|   0   |   1   |
+|   1   |   0   |

projects/01/Or.hdl

@@ -15,4 +15,7 @@ CHIP Or {
 
     PARTS:
     // Put your code here:
+	Nand(a=a, b=a, out=out1);
+	Nand(a=b, b=b, out=out2);
+	Nand(a=out1, b=out2, out=out);
 }

projects/01/Or.out

@@ -0,0 +1,5 @@
+|   a   |   b   |  out  |
+|   0   |   0   |   0   |
+|   0   |   1   |   1   |
+|   1   |   0   |   1   |
+|   1   |   1   |   1   |

projects/01/Xor.hdl

@@ -14,4 +14,9 @@ CHIP Xor {
 
     PARTS:
     // Put your code here:
+	Nand(a=a, b=a, out=out1);
+	Nand(a=b, b=b, out=out2);
+	Nand(a=out1, b=b, out=out3);
+	Nand(a=out2, b=a, out=out4);
+	Nand(a=out3, b=out4, out=out);
 }

projects/01/Xor.out

@@ -0,0 +1,5 @@
+|   a   |   b   |  out  |
+|   0   |   0   |   0   |
+|   0   |   1   |   1   |
+|   1   |   0   |   1   |
+|   1   |   1   |   0   |