I'm right there with you. We were using this to give students especially, the idea that it's more than the camera that you own that creates the image.
I can't count the number of times a student has said "I've got x Dollars to buy my camera for film", completely neglecting glass, lights, audio equipment, locations...pretty much everything else that goes into a shoot. It still amazes me that many people only think it's the camera or the LUT to make things look great.
Here's a math equation a buddy and I were discussing the other day:
Lighting + shot composition + lens + glass = Cinematic Awesomeness
Too many people only want to focus on 1 aspect of this to make things look great.
I think for those starting out, the Primers that Caleb does are very solid. Are there better products out there? Of course there are. However, for those on a budget; or someone looking to maximize their bang for their buck these are solid.
Love projects like this. I'm not sure I'd ever like the idea of wooden boards for a slider rig though. As noted above, wood splits. For a few bucks more, I would find some metal material and work with that instead.
I've always liked Benro's gear. Their S8 head is a beast. I'm very interested in seeing how much that jib head is gonna be.
I have shot a ton with the Nikon 5200 series and have been really impressed with it. The 5300 I have only limited experience with but have been very happy with what I've shot. Picture quality is very nice and there is a ton of room to color correct stuff in post.
If budget is an option, snagging a used or refurbished Nikon with a couple of decent lenses will get you up and running pretty quickly. There are thousands of inexpensive Nikon lenses that will give you great results.
Now, having said all of that...the G7 is also a great little camera. Having the option to shoot 4k and down sample is great. It really is a great B cam to the GH4. Just remember that the G7 isn't as solid as the GH4 and you're good to go.