An interesting project!
Looks to be going well. I can't offer any advice as I've never gone for converting rim to center fire.
You being in New Zealand reminds me of the first time I was there in 1967. My mom was raised in Lower Hut & went to Wellington Girls School. All her family still lives there. I was visiting my Aunt & Uncle when one night there was a rustling in the garden & my Uncle grabbed his .22 rifle. I was young & begged him not to shoot whatever criitter was out eating his veg. I snuck out & found it was a hedgehog. They let me keep it as a pet for the 2 months I was there.
My uncle told me that my two cousins were issued .22lr ammo by the government every month to help cull the rabbit population. They went back & forth to Australia a lot so I'm not sure which country that was in. I wanted to sign up for that.
I was there for the storm that sunk the Wahini & we went to pick up pieces of the wreckage that next morning.
My cousin Meredith is coming in tonight & I'm going to the airport to pick her up. She's from Lower Hut & will be visiting family here for a month or so.