if you are asking the question
you are not ready

I ask, what value is there is using tubes .5/.38/.5 in your frame?
100 to 150 grams !!!!!!!!!
use .75 or .8 walls
and have some crash resistance
long life
and also it will cope with your skills
Harsh maybe be
but the best path

and I have never used .5/.38/.5 tubes in the main triangle as it serves no useful purpose