All the welds look like they have good penetration to me,
my experience with light gauge welding is to flow a puddle, stop, let the glow fade off and just before it dissapears but you can still see it through the welding hood, burn another one and so on etc. Good luck, Looks Great.

Scott (Sonnys Dad) <img src="/forums/images/graemlins/kewl.gif" alt="" />