When I look at the truss rod access on my patriot neck I tend to think Peavey doesn't always attend to details real well. It looks like they chipped it out with screwdriver and a hammer. But usually they got the important stuff right. I agree the neck tilt seems like a janky thing, but for me it works, so I guess if it's good, it's good.
and, yes, the maple/rosewood neck on your 1st Gen Fury came off of an '87 3TS Fury.
That '87 3TS Fury body now has the all rosewood 32" Warmoth Warhead neck on it and a black pickguard (I need to take a better pic of this bass...you can see a stock pick of that bass before I took her apart for @58kites and I 