I have the same tank. I like your layout's use of vertical space. I think it'll make a great addition to the tank and add some depth once you get the fish in there.
My only issue (and it was one that I too faced), is leaving enough floor space for your scavengers. Whether its shrimp, or pigmy cories (in my case), I think it may be worthwhile leaving as small of a footprint as possible with respect to the driftwood. As such, I think the second, shorter piece should go.