The body is great at adapting to stress. If you want to workout six times per week, it might take a bit of an adjustment period, but it's certainly a possibility.
I would include at least one rest day, however. If you feel like you are being overrun, then cut down a bit. But I don't see a problem with what you're planning on doing seeing as yoga isn't particularly stressful on the nervous system in comparison to heavy weight lifting.