Looks like you’re getting it coming along there Andy
Spacer wise it appears that you’re maybe 2mm away given that it has larger 6 micron pixels and it’s APS-H and not FF.
You have some tilt between the top/bottom and left/right which is evident in the bottom left corner which has more out of focus look than aberration.
Although there is a lot of nice detail many of the smaller stars look a bit blobby. Focus maybe? Or possibly even artefacts of star removal?
Not meaning to be overly picky