Currently we don't have custom paper sizes for Newsletter Templates. One workaround is to use the current file and make any changes you need. Once you're done, save it as a PDF, and then print the PDF on your Tabloid 11x17 printer and scale the content to fit the page.
The added benefit is you don't have to try and scale all the content, as it will do that for you when printing. That works for any Word document you're using that isn't as big as you'd like :)
With the resources I've received from you, which I now can't do without, you've become one of my vital lifelines. This site gives me courage and enthusiasm because I know it will always back me up, no matter what. Thank you, and I hope you never stop generating new ideas that we can share, making life more meaningful for the vulnerable in our community.