Obviously with this workout, weights go out the window. Leg extension you'll want it on a fairly low weight, but still enough where it feels painful and burns for 50 reps. Then for the last pyramid set, start on 20% over your 50 rep sets, and drop by 10kg each time
Squats, it depends. Me for example when I do this workout, I'll do 80kg back and 60kg front squats. The key is NOT TO STOP, as the minute you stop and lose momentum, it makes it so much harder, just keep going. Front squats, don't lock out fully at the top, just constant piston like movement, up and down.
With the single leg last set, as soon as you've done it, put both feet on as wide as they'll go, knees out and come down as far as you can. And from there just rep it out, again don't stop as you'll only find it harder to start again.
Walking lunges, start at BW and add 5/10kg at a time, so aim to be doing 20kg for the last set.
Everything else is self explanatory.
Key though, is speed! 30s rest periods still apply (except for lunges where it's no rest)