Now animate them in more interesting ways. For example your styff does not appear to grow it just steps into existence. Thats not very fabulous.
I mean a early test into thiskind of stuff looks like this:
growmockup.mov
Please note this was how it looked piror to designing it to take lsystem data in.
The idea is that i dont build segments but build the entire curve in one go, then use path anim or wire deformation to scale a cone along teh curve.
Theres nothing spectacular in ding lparsers (my firts use of a lparser happened in 1980's) or generating struts of material doing so semlessly and in interesting ways is.