I cut and measured everything but as I only have access to metal welding I got someone to weld the pipes together. I'm a reasonable welder when it come to metal, and am sure I could weld aluminum as well, but no equipment means no practice.
But indeed, the welds are nice. I'm very pleased with the result and imo was well worth the time I put into it
except that damn SPlit R which I now have to reajust again lol!