So, I finally got the cooling box built
http://ghonis2.ho8.com/rebelmod450d16d.html
Not quite as polished as this one but not bad. I'll post some photos.
I haven't quite got the seal around the t-ring extension tube sorted out but I plugged the hole as tested the system on the weekend.
I got it down to 2.8 degrees and wonder if that will provide any appreciable advantage over no cooling.
What are other's thoughts?
cheers
niko