Looks good to me mate
Are you going to have to emboss or print with "For Race Use Only" as per some pathetic EU regulations or will it be legend-free (except for your logos of course)?
A big thank you from me and I am sure from many forum members for all your hard work and development for a relatively small market (at the moment). With the addition of a re-worked throttle body, drop-in high compression piston & maybe cam and PCv and tuning I think you may be close to the ultimate XT660 engine without significant and costly engineering work to increase capacity.
ps. Will you include the PCiii map with the device or donate it to the site via Kev - PLEASE?