Looks no bad, apart from the overly complex exhaust, that'll do nothing for exhaust flow or sound, but should stop the carb icing if you ever take it out for a thrash on a cool damp autumn morning!
As for these two mods:
"- Modification of the original kick
- Total removal of decompressor elements"
I am not sure at all!
DR-600-supermonoGood health, Bill