I can confirm that this rom works on locked bootloader r800x.
Before flashing, I made sure to unlink all my apps in Link2SD, and wipe all data from the recovery. It says it wipes on install, but that messed up on me the first time I tried.
Uncheck all GSM options and uncheck the wipe system option.
I suppose I could give it another go, but here is what I did that did not work:
1. Boot into CWM Recovery
2. Did a Nandroid
3. Wiped Factory and Data
4. Wiped Cache and Dalvik Cache
5. Install zip from sdcard/Choose zip from sdcard/DFRCDMA3.0.2.zip
6. Reboot system now (when ROM was done flashing)
That's when it hangs on the Sony Ericsson boot logo. Forever. I tried a battery pull and then rebooting, same thing again. Tried a few more times but since I no longer could get it to boot at all, I ended up flashing the ftw again, cwm, and restored my Nandroid.