Just some handy welding videos for MIG

Looks great, so far! A little bit of a twist in it, but like you said, as long as it gets the job done, it's not a big concern. One thing you could do, if rocking drives you nuts, is to use some leveling feet and weld the nuts in place. Be sure to put the thread of the feet in first and cover the threads, so you don't distort the nut beyond use.

This will help you down the line, if you have any projects that require a level surface to produce.