Most systems are in the 60-85 pound range depending on mufflers and tube size.
That there is one sweet looking muffler.
Very nice work.
I for the life of me could not find any perforated tube like that to make my own Ultra-Flo mufflers, so I field it out to the cat in Canada to make 'em.
Where did you get that stuff?

The kick back is the weight difference and most probably the sound that you will get. It could be strange sounding with an aluminum system, but it will get used to it and it will be much lighter.
Are you making the system out of stainless only with the exception of an aluminum X you say?