Everything sounds good to me, although personally, I would up the total harmala dosage to somewhere between 150-200mg. That is usually enough for most people for full inhibition. I tend to take even more harmalas than that just so that I don't undershoot, but that is personal preference, of course.
As long as you are able to function and move around, load bowls and operate lighters, I say there is nothing wrong with adding marijuana to the mix.
In most psychedelic situations I've had, marijuana tends to intensify the trip, bringing new dimensions and depth to it. If you normally smoke during trips, it shouldn't be a problem in any way.
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