Hi Tannehill,
The last 2 photos are just with the digital camera sitting flush in on the tube (empty tube). I was just making the point that this is also what I see through my cheshire (except with crosshairs).
I use the laser without barlow to align the secondary. All i do is make sure the beam points directly at the circle in the middle of the primary.
I then use the barlow attachment to align the primary. Then I check with the cheshire.
As for your "squaring my eye over the focuser" question, I'm pretty sure that I can. But I'll confirm that tonight when I'm back at home.
One question...what's vignetting? (I'll google this).
Thanks a lot for your help/advice.