Add dimensional drawing of enclosure

Author: nseidle

docs/hardware_overview.md

@@ -140,6 +140,10 @@ The enclosure is industrial 3D SLA printed with an effective IPX rating of IP52
 
 The enclosure is secured with two screws on either side of the unit. The top cover can be removed to expose the inner assembly.
 
+![Alt text](img/SparkFun%20LoRaSerial%20Enclosure%20Dimensions.png)
+
+*[LoRaSerial Dimensional Drawing](img/SparkFun_LoRaSerial_Enclosure_Dimensions.pdf)*
+
 The enclosure includes mounting holes for wall or rack mounting.
 
 ![LoRaSerial Enclosure UV Exposed](img/SparkFun%20LoRaSerial%203D%20Printed%20Enclosure.png)

docs/img/SparkFun LoRaSerial Enclosure Dimensions.png

@@ -45,8 +45,8 @@ Occasionally, SparkFun may release new firmware for LoRaSerial. The
 
 The following hardware documents are available:
 
-* [Schematic](https://cdn.sparkfun.com/assets/b/e/9/a/d/SparkFun_LoRaSerial_915MHz_-_1W.pdf)
-* [Eagle Files](https://cdn.sparkfun.com/assets/f/b/b/6/f/SparkFun_LoRaSerial_915MHz_-_1W.zip)
+* [Schematic](https://cdn.sparkfun.com/assets/9/3/0/6/e/SparkFun_LoRaSerial_915MHz_-_1W.pdf)
+* [Eagle Files](https://cdn.sparkfun.com/assets/d/e/c/e/5/SparkFun_LoRaSerial_915MHz_-_1W.zip)
 * [Semtech SX1276 datasheet](https://cdn.sparkfun.com/assets/7/7/3/2/2/SX1276_Datasheet.pdf)
 * [Ebyte E19-915M30S Datasheet](https://cdn.sparkfun.com/assets/6/3/e/e/3/E19-915M30S_Usermanual_EN_v1.20.pdf)
 * [Atmel SAMD-21 datasheet](https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Atmel-42181-SAM-D21_Datasheet.pdf)