[A/S] Rear-end rebuild

[maconner@xxxxxxxxxxxxxxx]

Hello all-
During our maiden voyage (2 wkends ago) in our restored 69 TW I 
noticed a drip in the rear roadside area.  Yesterday I went in to 
explore and dropped the rear bellypan (which was corroded @ the rear 
interface).  The problem may be coming from inside the 25"x51" box 
that was inside the belly.  This is a rear bathroom model and perhaps 
this big metal box is the drip basin.  It is connected to the frame 
by means of 2 steal cross members.  I plan to remove and replace the 
box, and fix the leak (it must be coming from my blackwater tank, hot-
water heater, plumbing or tub) that maybe covered by it.  Has anyone 
been here and have any advice for me on what to watch out for?  
Anything tricky? Are these boxes still available?  What grade of 
aluminum shall I replace the corroded section with?  Thank you- 

Mike