You have it here:
http://www.iceinspace.com.au/63-434-0-0-1-0.html
I made mine for 12" dob. At the end of the page you can download the picture and resize it for your need, print it, cut out pieces, join them together, fun stuff
For Alt. I simply bought digital thingy (whats it name)from Bunnings for $20
dollars.
bob