I'm having a good time modifying and improving my R200.
So far, I've shortened the front chain, added a spacer to the bottom bracket to improve the chain line, added a kickstand, and a rear rack.
The kickstand is mounted with an aluminum angle bracket I made to screw into the disk brake mount on the dropout.
The rack started life with a seat post mount and required removing the stock mounting post and manufacturing a mount that mimics the one from Trek.
I love making stuff.