Made huge progress this weekend and am working on it today as well.
I've read that for swapping a 5.0 into Rangers and 1st gen Explorers that a dual dump Mustang oil pan is needed to clear, so I bought one from a member here that had been clearanced for the rear beam mount. Swapped my oil pump and pick up tube, then went to put on the new pan (painted green by the previous owner) and of course it didn't fit. The clearanced section hit the new larger pick up, so we bent the pick up ever so slightly out of the way and got it to work.
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Then I installed a remote oil filter adapter, and it was time to mount the 1st gen steering box. I used the same mounting plates that Brian1 made on JTX's SAS. The box ended up barely squeezing into place and contacting a few things, plus would make getting to the oil filter adapter impossible without lifting the engine or removing the steering box. So I notched into the inside of the frame rails and boxed it all back in to gain a bunch of clearance, and I'm really happy I decided to do that.
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While I was doing all that a couple friends started trimming the TTB crossmember to fit. It fits surprisingly well, like it could have been there originally. And it also looks like the stock oil pan may have fit above the crossmember after all, but now with the extra room I'm hoping I can drop the oil pan without pulling the motor, if I ever have to. I'll get pictures of that when it's in its final position.