Thanks guys!
I removed the rear axle today for some final details. I tapped the bottom for a small, flush fitting drain plug.
When I first ordered the rear axle housing, the advert stated that the center part was made from 1/4" steel. However, they neglected to include that the rear cover part of the center housing was not 1/4". The rear cover section is the same thin sheet metal as on a stock housing. After talking with them on the phone they told me that they did in fact make a thicker rear cover section and they sent one to me for free.
Today I finally got around to cutting, fitting and welding the thicker cover piece right on top of the existing thinner one, it is sort of laminated now. I didn't bother doing the section above the back brace as I figured that area should be out of harms way, I hope!
Got paint on my Wrap Trap and rattle canned the housing for good measure...