There seems to be some uncertainty regarding the origin of this particular Metal Gear Ray. Some believe that this was a newly designed model, while others believe that it's the same (albeit modified) Ray from the tanker incident in MGS2. What is known for sure is that Ocelot utilizes this mecha to battle Snake in the heavily damaged Metal Gear Rex towards the end of MGS4.
Typically when I start on a kit, I like to look on google image search for models other builders have completed. However, as far as I have seen, barely anyone has built and painted their kits.
This Kotobukiya model shouldn't be confused with the much larger 3A toy. Like many of the Kotobukiya models I have completed I would encourage beginners to be wary of taking this kit on. I say that for the following reasons:
There are seam lines along many of the prominent areas of the kit. Most of these areas will require putty in addition to glue to level out.
This model comes molded in some pretty bland colors, it takes planning and a lot of paint to pull off any of the color schemes featured in the manual. Significant amounts of masking is also an absolute must.
The decals are likely going to be another stumbling block for many, the diagrams showing the camo decal layouts are not particularly informative and there are many similar looking decals.