Welcome mate. There is a great article (to the left) of moding a Newt for DSLR imaging.
http://www.iceinspace.com.au/63-441-0-0-1-0.html
There is a few fellas doing Newt imaging here and the coma correction and field flattening is a thing you will have to address.
IIS has at least 4-5 world class planetary imaging folks here using Newts.