Replying to Lil rail advice needed

aight so my shop teacher at my school is super into welding rails, last year he helped us make a 20ft flat bar rail
he wants to know what kinda rail we want to build this year, so im reaching out to u guys for some ideas,

 i want it to be:

- something with a kink or a curve to it

-not quite as mellow and easy as the flat bar rail

-mellow enough that you could still do shit on it(switchups), so for instance not a ridiulous dfdfd


thanks!