its really dificult to get a frame to stay square,..if you are patient and watch loads of videos, (welding tips and tricks) a novice could do a decent enough job.....get some scrap metal and practice welding 6mm long tacks consistantly...cutting the metal square and then v out is a skill on its own.1mm cutting disks again practice...what materials are you thinking of using?? how big is it going to be??if you post your design and the guys think it will make a decent machine we can walk you through the metal work.