Nice, man! Looks good. I also used a Dremel to cut off my lids. Took me about 45 minutes as well but I went through like 7-8 cut-off wheels. I finished polishing mine last week with an angle grinder (Thank god it's over with!). I split it up into 2 days. It took me about 4-5 hours total. I ruined two shirts, my back hurt for about 4 days, and I had some wicked boogers for at least 2, lol.
It really makes the kegs look so much better. Mine is nowhere near Bobby_M's elite mirror finish, but as you're doing it, you can see that if you really take your time, you can have kegs just like his.
After I was done with the medium finishing disc, I really sort of rushed through the rest of the steps and as a result my final product isn't nearly as clean.
Keep up the good work!