So you're going to do something like this?
I can't find the other pic of the centersection, but the axle tubes had another washer welded on and the tubes were bolted together with a t/e-maxx diff sandwhiched between. From what I remember it held up very well, he ended up bending all the suspension links, not the axle. I think doing something similar where the tubes unbolt in the center would be stronger, and easier to assemble/disassemble than having a continuous notch for the cvd's and diff to come out of. Just tossing it out there, can't wait to see some pics.