Heh, I was so busy replying, I forgot to post an update
So today I finalized the PSU location and ripped a lot of annoying plastic nubs and mounts off so that the PSU could sit nice and snug where it's supposed to. This also gave me an opportunity to mock up my motherboard and HDD from cardboard and do a test fit.
Tore out some nubs and plastic mounts on this corner:
And some near the front of the shell:
Now the PSU sits flat and stable on the base
With that out of the way, I mocked up the motherboard with a 170mmx170mm square of cardboard. First hitch of the day.
It doesn't fit! Two of these posts that are supposed to take the screws that hold the top of the shell down are in the way:
Clearer shot of the problem:
Now, since those posts are held to the casing both at the base
and by a little piece of plastic on the side, I figured it wouldn't be too bad if I could somehow take off the part attached to the base and leave the post itself attached to the side of the case.
A lot swearing, sweat and sawing resulted in this:
And the board fits perfectly now!
Also, since these mods make it obvious that Sketchup I made wasn't 100% accurate, I needed to find a spot for the HDD. This is what I came up with:
Of course, it won't be taped there, I'll be screwing it onto some mounts that I have yet to make.
Oh, and here are the remains of the butchering (minus the tons of plastic dust that's now found a home in my carpet):
More soon (hopefully cleaning up the piss-poor wire management inside the PSU).