Except now I realize the PSU I linked is a lot longer than anything that could fit in the case. It seems like there's a very real power limit to the D17 - I couldn't find anything close to the 750W recommended for a 3080 build in flex ATX.
On the D17, it looks like the PSU is set up to poke its AC plug out the top of the case. Is this intentional? Note how the SFX standard seems to put the AC plug along the long side of the PSU.