Update all files, removing placholders.

FMUv1/README.md

@@ -5,7 +5,7 @@ This is the first Pixhawk FMU design, and was intended to be used with various p
 > **Warning** This design is end-of-life.
 
 <span></span>
-> **Tip** General [Pixhawk project](http://pixhawk.org/) information about open designs, schematics and reference hardware, FMU versions, licensing, and trademarks can be found in the repo [README](../README.md).
+> **Tip** General information about designs, schematics, reference hardware, FMU versions, licensing, and trademarks can be found in the repo [README](../README.md).
 
 ## Design Files
 

FMUv2/README.md

@@ -3,7 +3,7 @@
 FMUv2 combines the FMUv1 and I/O designs into a single package.
 The open design provides both schematics and open reference layouts.
 
-> **Tip** General [Pixhawk project](http://pixhawk.org/) information about open designs, schematics and reference hardware, FMU versions, licensing, and trademarks can be found in the repo [README](../README.md).
+> **Tip** General information about designs, schematics, reference hardware, FMU versions, licensing, and trademarks can be found in the repo [README](../README.md).
 
 
 ## Design Files

FMUv3_REV_D/README.md

@@ -1,11 +1,22 @@
 # FMUv3 Pixhawk Open Hardware Design
 
-FMUv3 open design (along with IMUv3 + PSMv3 support components)
+FMUv3 was introduced in 2015. Identical to FMUv2, it doubled the usable flash to 2MB.
 
 The FMUv3 design is used in the Pixhawk 2 FC board.
-This hardware is the result of a collaboration of the open hardware development community and 3D Robotics and has been designed in Altium.
+This hardware is the result of a collaboration of the open hardware development community and 3D Robotics.
 
+> **Tip** General information about designs, schematics, reference hardware, FMU versions, licensing, and trademarks can be found in the repo [README](../README.md).
+
+
+## Design Files
+
+The design is provided in [Altium Designer](https://www.altium.com/) CAD files.
+
+It consists of schematic files (*.SchDoc), BOM listings, and includes open reference hardware PCB layouts (.PrjPcb). 
+
+> **Tip** PDF versions of the schematics and PCB layouts has been made available for easy previewing (i.e. if you don't have Altium Designer).
+
+
+<!-- Removed text: FMUv3 open design (along with IMUv3 + PSMv3 support components) -->
 
-## Licensing & Trademarks
 
-Information on licensing and trademarks for Pixhawk designs can be found here: [Pixhawk Licensing](../README.md#license)

FMUv4/README.md

@@ -1,4 +1,17 @@
-FMUv4
-=====
+# FMUv4 Pixhawk Open Hardware Design
 
 The open hardware design of Pixracer based on FMUv4 is provided [here](https://github.com/AUAV-OpenSource/FMUv4-PixRacer).
+
+> **Tip** General information about designs, schematics, reference hardware, FMU versions, licensing, and trademarks can be found in the repo [README](../README.md).
+
+## Design Files
+
+The design is provided in [Altium Designer](https://www.altium.com/) CAD files.
+
+It consists of schematic files (*.SchDoc), BOM listings, and includes open reference hardware PCB layouts (.PrjPcb). 
+
+> **Tip** PDF versions of the schematics and PCB layouts has been made available for easy previewing (i.e. if you don't have Altium Designer).
+
+
+<!-- Removed text: FMUv3 open design (along with IMUv3 + PSMv3 support components) -->
+

FMUv5/README.md

@@ -3,7 +3,7 @@
 FMUv5 was released in 2018. When compared to previous versions it has a new processor, 2xRAM, new sensors with higher temperature stability, and is much more configurable. 
 More information can be found in the [Pixhawk4 Data Sheet](Pixhawk4-Data-Sheet.pdf).
 
-> **Tip** General [Pixhawk project](http://pixhawk.org/) information about open designs, schematics and reference hardware, FMU versions, licensing, and trademarks can be found in the repo [README](../README.md).
+> **Tip** General information about designs, schematics, reference hardware, FMU versions, licensing, and trademarks can be found in the repo [README](../README.md).
 
 
 ## Design Files