The thing would be unbreakable, but I'm confused by the pic...will they configure both a passenger or driver side drop? Both are pictured, unless one is a negative image. Toyota housings are passenger side drop, which is why I wonder.
To fully build a D44 to that level would still cost upwards of $2500-3000 if you went with a selectable locker, all new hardware, chromemoly shafts and CTM joints, and it would have much smaller axles. That said, We're not making enough HP to hurt that thing.
A budget build on a D44 can be done for around a grand, depending on purchase price. I did mine for about $1600 total using stock shafts, precision gears, all new steering, resurfaced rotors, remanufactured calipers, a reconditioned ARB locker, warn premiums, new balljoints, 760X Ujoints, and a Warn diff skid.