I primarily use LDD because it's far easier to use, but I recently acquired MLCAD and thus decided to use it to recreate my R-9A V3 Model.
About this creation
Due to not knowing how to make metallic colors in LDraw, I had to make this version of the R-9A model a normal gray instead of the original model's silver.
I couldn't actually find the part I used for the Vulcan cannon in the LDD Version in MLCAD, so I substituted this instead. It's actually probably more faithful to the Vulcan's size, as the Vulcan on the V3 model could be said to be a bit small. So it's arguable that this is actually a V3.5.