A video in action on that machine is going to be kind of hard. All you would see is coolant splashing around LOL.
I guess the break down of that project would be as follows.
Measured the original chassis with calipers.
Modeled the new chassis in Solidworks with the changes I wanted to make.
Programmed the aluminum fixture plate. in Edgecam.
Programmed the machining of the material in Edgecam.
Ran the fixture program and the part program on the machine.
The machine I used was a Mazak VTC-200. with a fusion Control.
There are actually two big plates in the one pictures.
One plate is a pallet(the one with the t-slots)
The second plate is the aluminum fixture plate.
It is mounted up off pallet on 123 blocks to keep from damaging the pallet when drilling thru the fixture plate.
The fixture program drills and taps certain holes in the fixture plate. These holes line up with some of the holes in the completed chassis.
Once the fixture was complete I loaded the material blank and clamped it down. The first thing the program does is drill all the holes.
After the holes are drilled I installed screws thru the material into the fixture plate. After the screws are in place the contouring of the parts begins. After the contouring is complete remove the screws and you have your finished parts. The only thing left is to countersink the holes. Now that I think about it I could counter sink the required holes in the machine and save a step.
Keep in mind this was done a big money machine. This was prior to having the machine I recently bought for my garage/shop/mancave/bar

I now use the same process just on a smaller machine and not at work after already being there 12 hours LOL.
Hope this helps a little bit.
Thanks,
Brian