I know exactly what you're saying about the welds not looking "pretty" without some sanding and filing. Thanks for the compliment on finishing off the welds but, there's lots of room for improvement in my opinion. I'm using a MIG welder with an argon / carbon gas mix. I've used fluxcore on past projects. Especially for areas where I was welding together some thicker pieces. The difference between using gas for shielding verses fluxcore is pretty dramatic in the way the welds look. I've been able to get a far better looking weld using gas. Once there's no deadline and, before finishing off this frame, I think I'll run a few tests. Weld up a few samples and smooth the connections with solder, jbweld and aluminum filler for a direct comparison. Will give me a solid understanding of what it's like to work with each and what the final results look like.