Glad to see someone else using fluxcore. I've been using a Clarke 130 EN to weld a lower quarter and part of a sill/wheel arch on my Rover 216 GTi and I have found it quite straightforward but quickly learned that on 0.7mm thick panels, you dont need a 1mm gap. I've found you can still get full weld penetration when the gap is 0.5mm to zero and less distortion. Good luck with your project and channel.