Sorry, I should have updated this thread. I guess I didn't think about it because I never got the answer for sure.
Sent emails to both MagnumMopar and Tanks Inc, via their websites and while I got responses from both, neither seemed willing to pull one out and lay a tape measure on them. Both pretty much said "only our pumps fit", all though Tanks Inc did say the depth was about 1.5".
I did find drawings for the gaskets on Tanks Inc's website which gave me something to use to try and scale some dimensions off the pictures. Based on that, I concluded there isn't enough room in the recess without at least welding up the fuel sender hole, and even then the baffle in the bottom would probably pose a problem and I wasn't sure there was enough room in the recess front to back.
In the end, I decided to just buy a standard replacement tank and weld a pan into it.
I did suggest to Tanks Inc that they offer a tank that is only stamped, and welded together, but no holes or baffles welded into the recess area. Something someone could use to build a custom setup. No idea if that would fly, but seems to me from the outside that it would be fairly cheap to offer since the stamping dies are already done, and no labor is required after that other than welding the top and bottom together. Who know, maybe something will come of that someday.