Hi Kathy.
A Losmandy G11 would hold a 12" newt np but it's unlikely to be good enough for what you want to do. You may want to consider a 11" or 12" SCT. It will handle them np. 12" and up in a newt you may want to look at the Losmandy Titan or something similar. MMmmmmmm Titan. You could easily go up to 16" on that. Plus with the new Gemini 4 controller setup you could be sitting in front of the fire inside, knitting a new seat cover for your 1000G
and imaging away to your hearts content.