Interesting setup, but wonder what the effect of having the mounts oriented vertically rather than canted is. In the stock setup, with the solid rubber mounts, the front two are tipped towards the back and inward while the rear is tipped forward, for a kind of tripod setup. Changing one of the three legs to a vertical arrangement like this does, I think, would put those two rear mounts in shear and would allow the whole powertrain to shift backwards slightly -- that might have implications for NVH, driveline position, firewall clearance, etc.
The stock setup has the 3 mounts kind of balanced against each other; theoretically if all 3 are healthy this is kind of an engineered system, so altering one end of it affects the other two. Of course if all 3 mounts are tired then you don't have much to lose by changing it, but for the $10 that a new stock trans mount costs, I think just fixing what's broken and keeping the rest stock makes more sense...
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