Hi Robin, appreciate a lot your suggestions, this is my first plasma im build so i have not much idea about it, i was thinking in to make it light too but when i was designing it that's what i got lol! i was thinking in to make a solid support but not too heavey, if you have any suggestion of how do i can improve the actual design i will appreciate it a lot.

About welded iron you means the "yellow" parts? or what exactly do you means?

Thanks again!