Pretty slick , but a few comments
Safety:
1) fix the damn laminator so you don't have to mess woth the cover take the little board off the cover mount it on the machine and put some isolation over the exposed electrical comtacts
2) uv lightbox . Bare wires plugging into an iec connector... Seriously ? Why no proper powerplug ? And why is that live mains carrying pcb not in a plastic box ?
3) one gloved hand, one bare hand. The bare hand is touching chemicals more than the gloved hand in the video....
Thru hole metallisation. That's just sticking a bunch of wires in holes.. I thought somebody finally had cracked the home rout to copper plating without all the chemicals.... A bit disappointed
Now, as far as in dustrial process.. You are pretty close , but also far off.
The principles are there but there are a few important differences.
Dry film negative photomask , check. Works waaaay better than positive photomask.
Lamination, check
Exposure, nobody uses photplots anymore. They are expensive, wear out, get damaged. Its LDI or now even Maskless imaging which can create incredibly fine patterns. LDI: a laser writes the pattern to the board. Same principle of a laser printer. Board moves horizontal while a laser scans the rasterized image vertically. Maskless imager: a DLP chip ( like used in video projectors ) is used to deflect a UV powersource. can write halftones to create perfect circles.
Developing. Check
Etching check
Cleanup check
Soldermask. Dry film.. Not used anymore. Too fragile. Too much waste. Liquid photomask or printed photomask ( silkscreen) : liquid photomask : spray on , expose uv , wash off.
But, for home usage the film way is the only solution.
Soldermask.. Dynamask ? Developer is sodium carbonate.
You could even do a text layer. There's got to be white dryfilm out there...
All in all a pretty good video. But bad example for safety !