Chainline accuracy

5mm too far, 1 or 2mm okayish perhaps. i am going to swear at my latest build in a minute. could be out by up to 3mm

5 mm is too far out 1 or 2 mm ok ish but you will throw the chain when you least expect it, like riding down a hill. Could you use a maller ring and cog combo to get the same ratio and have clearence?