I received my gen 703 crown today from eBay. Unfortunately for @themannier, myself or anyone else with high hopes, the gen 703 crown will not fit on the stock MBW tube, nor on the Athaya tube. The thread is wider then both. Even though the Athaya tube is wider then the MBW, it still isn't quite wide enough. This is all true unless I managed to get an incorrect crown but I don't believe that is the case. Look wise though IMO the Athaya from the outside is very close to the gen crown and I think it is a suitable part to use in place of a gen. I think it's best to save the $100+ to be spent in a better way on your build.
Here are some comparison pictures:
Athena Tube (left with crown) vs MBW (right no caseback)
Athaya Crown
MBW Crown
Gen 703
MBW with stem vs Gen
Athaya with stem vs Gen
Athaya (left), Gen, MBW (right)