I am only working 20 hrs/week right now, so not exactly the same. I have a 7th grader and we're doing a blend of online classes and stuff we design together. We have been homeschooling for over 6 years so far except for last year where she attended school half-time. I have always worked part-time, although previously with 2 jobs so it neared full-time. I feel pretty good about our curriculum decisions, although I know the reality never works out exactly as planned. I am lucky as I can bring dd to work with me regularly.
What sort of things are you looking for? I've chosen a couple things that will allow us to explore subjects as a family. We will be doing a music history course that is dvd based and we will watch together for 30 minutes in the evening once a week. Dd will do some additional work on her own the rest of the week. We will watch the Joy of Science from the teaching co. another couple times per week for 30 minutes an episode. They work well during dinner. LOL We are finishing up How Art Made the World from Netflix and it has been an enjoyable family activity. I am planning on doing some of our science experiments on the weekends with dh. She will be doing the bulk of her language arts and math online. We will get in some additional literature by listening to audio books while we commute.
Give us some ideas about what your girls like, their strengths and weaknesses, etc. and you will get more specific ideas of things to try. Do you have someone to watch the girls who can direct some of the school work? Can you IM, call, email, or skype from work with them? Will you have some evenings and weekends to do things together? Do they have some ideas of things they would like to explore next year? Are you looking for a complete online school for them to participate in?
It can work, but expect a lot of brainstorming and tweaking of plans as the year progresses!