Have you seen this comparison on ERW tubing Vs DOM tubing.....From an engineering perspective why are you using seamless pipe? To my knowledge all motorcycle manufacturers use ERW tubing exclusively for frames and engine guards.
Of note in many applications the fact that the tubing (or metal) will bend more is advantagous. While DOM can generally be used in lieu of ERM it's more expensive and typically doesn't provide any benefit which is why I question it's use in many applications. Trust me, on my rigid frame development if there was any advantage to DOM over ERW I'd be using it.I by no means have the skill set to design chassis or build frames for motorcycles. I just wanted to know what the advantages and disadvantages of using either type of tubing and you have answered it.