How easy is it to get what's shown in those screenshots? (and a number of the other recently emulated systems for that matter)
Well, you need to actually install HP-UX 9 for the screenshots that dxl has been posting.
For the SGI machine screenshots that I've been posting, it's literally just a matter of booting the systems up for most of them. SGI boot PROMs are unparalleled in terms of looking pretty, having been unsurpassed even by modern PC BIOSes that have proper GUIs.
In the case of the Gentoo screenshot, you just need to boot the machine with the CD image mounted, then press '2' to select Install System Software, press Enter twice, and you're golden.