James, I like your two piece design. Inevitably, the ZCI will need to be replaced (I¡¯ve needed to shim mine several times over the course of about 18 months).
Fred, I am interested how you go with your design. My first started out similar, and I found that it was too high to permit the blade shroud to be low, which meant that the blade remained high (if you want to use the shroud). Do you have a way around this?
Regards from Perth
Derek