So it turns out fitting the PSU is a lot tighter than I initially planned on, mainly because I have to rotate it a full 180* rather than the 90* I initially planned on. But that's ok. I actually have room and resources that I'm going to recess the PSU about 3/4" forward of the front steel panel, and weld the plate on the front panel to hold it there. With the power plug, it will still be hidden behind the front plastic panel, so all is well.
On that note, I wanted a new, fully modular, better looking power supply to replace my modified XFX 750w non-modular I've used in previous builds. So, being cautious of modular plugs and overall space constraints, I found one to fit the bill-
www.newegg.com/Product/Product.aspx?Item=N82E16817207028
XFX 850w fully modular, 80 plus GOLD certified :thumb:
XFX PSUs are made by Seasonic, one of if not the best PSU manufacturers, and I've owned one for each of my previous builds, so I was obliged to stick with them for this build. I would have loved to try an NZXT Hale 90 v2, but they are too long.
Oh, and I cut the top panel, mocked up the mobo tray and other stuff, and painted the door in white primer

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