Thank you all for your replies...message received! $300 ain't gonna cut it, especially with the track ball and spinners. My hope is that if I only include the basics (two joysticks and buttons), and find some "donations" for the PC/monitor/keyboard, I may be able to come close. The $300 was kindof arbitrary...but tied to some money I earned through my photography. I was aware that this may not be possible, and hence the questions mark in the video.
Any advice on where to source the joysticks/buttons/trackball/spinners? I originally was looking at the X-arcade TankStick before I was planning on the build. They offer a DIY kit that seems like good quality parts...but I don't really have anything to base this on other than the pictures.
I looked at Ultimarc too, but they seems more expensive than X-arcade.
Then I looked at Amazon, and started searching for a Canadian supplier. I have found a couple, but they don't look like as well-established as X-arcade, and I worry about the quality. Perhaps they would be the same quality or better, and I am judging books by their covers?
My gut is telling me to stick with X-arcade, as I know they have been around for a long time, and the DIY kit should all work together nicely, and with MAME. Is this a bad decision? Again, thank you all for your advice for this noob!