The comment on thickness made me do some comparisons and I found the following. I probably would not spend this much on my build but I just thought it was interesting.
According to the speedymetals website 1" .065" wall thickness 48" long tubing weighs 2.6208lbs which seems like the most popular option for the 25.4mm machine and considered the best on the forum for wall thickness vs weight.
3/4 inch Emt 48" long weighs 1.74lbs according to cooperindustries and has an ID of .824"
A solid 19mm pultrusion carbon fiber rod .750" thick weighs 1.2lbs according to acpsales and sells for $63.
So it looks like a peice of 3/4 inch emt with a 19mm thick carbon fiber rod in it would weigh only roughly 300g more than the stainless steel piping not accounting for the epoxy.