Ok, while I'm not gluten free I do have friends who are and we run a twitter chat every Tuesday for allergies and intolerances. Here is the website by one of my co-hosts who is coeliac
http://nellbe.com
It's an awesome website as she puts down menus for the week along with recipes.
I didn't think coeliacs had to avoid buckwheat but I'm prepared to be corrected on that one.
You need to be really careful with preparing food as it only takes a smidgeon of contamination from gluten for the coeliac to have trouble. If you wash all the dishes well before hand and be really careful with any sauces you buy you should be okay.
There may be gluten free canelloni, it's been a long time since I've done that but they're probably made by Orgran. There's a lot of things available at Coles nowadays.
Those recipes look ok, but will depend on finding gluten free stock etc.
I can find other websites for you if you want.