There are some truly inspiring builders on this forum. Then there are these shade-tree wrench swingers who do not deserve the name "builder". What happened to taking pride in one's work? I could never, in all my life, in good conscience, charge even a penny for labor like that. Heck, I wouldn't even want my name associated with it. If, heaven forbid, I made a mess like that - I'd find a parking space along a deserted stretch of road, and some dynamite. That is just well and truly Gawd-awful.
Please do not blame the customer in any way, if he rode it at all. The fumes from that high-mounted exhaust would have killed some brain cells and clouded his judgement.