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The 3" channel extension is black-tank area & must likely be duplicated; that said, it also formed the hose-storage trunk at the rear bumper on many model trailers but I don't see the 12-inch plus extension of the frame past the shell that makes up the trunk area.
'Sculpted relief' is 45 or 60 degree slant - something like notching the beam sides out and hammering the bottom up to meet the new angle to be welded...
I studied my stair glider mechanism and thought of tacking a thin sheet at the top of the outrigger and letting it drape without attaching at the bottom to close off the wrap area & allowing the sheet metal to be bent out of the way if and when access was required. We have Deer Mice up here that can get through unbelievably small openings, true it's not like Norway Rats (that I bet my '73 had) but still worthy of mention at least while the project is still open...
Also - provisions in the sub-floor for heavy 120VAC wire run from trailer front to 12VDC converter area to allow easy tow vehicle mounted generator hookup is on my list of to-dos; with the freshwater tank, step assembly and vermin gnawing being the obstacles you can dodge more easily now...
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