Has anyone done mods to there SKS like these guys did?

They milled off the bolt lips so duckbills can be removed and inserted with the bolt closed, and moved the cocking handle to the left side. Guess not too much to worry about modding a 200.00 rifle.
The push forward mag release mod looks interesting as well, as I watched a few videos on doing mag changes.
https://www.youtube.com/watch?v=GTT2sLPkpP4

They milled off the bolt lips so duckbills can be removed and inserted with the bolt closed, and moved the cocking handle to the left side. Guess not too much to worry about modding a 200.00 rifle.
The push forward mag release mod looks interesting as well, as I watched a few videos on doing mag changes.
https://www.youtube.com/watch?v=GTT2sLPkpP4