Did you look into Gateway to the Classics? It is a curriculum established by the Yesterday's Classics folk, using vintage books in a nice, easy to read format online, complete with lesson plans. I pay $50 a year for it, but am not sure of the price right now. You would need to add math (it sounds as though you have that covered) and I would add in some more current science books, but the rest is really nice to use.
We enjoy doing read alouds from it, and I love having the ready-made schedules.