60MB TIFF worked on a Mac Pro 2x2.26 Xeon / 16GB / OSX 10.5.8
OK, I can see how this can work - just drew this up in 5 mins: (i.e. uncut/cropped, no sharpening (!), no major work done, flames not accepted)
Initial HDR image
With Topaz detail
Grayscale conversion in Lightroom:
Only comment so far is that I challenge the difference between "details" and "boost" in the menu - I understand their purpose, but the sliders don't work intuitively.
I will play around a bit more and let you know.
Thanks much - am impressed so far!