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Three systems are the minimum, one for each architecture. More PPCs for avoiding hotrods.

An LC475 is pointless when a PPC can meet up at 7.5.5 and run far newer system versions.

The problem being you need to meet at the versions (a Mac having 7.6 minimum when your Plus has 7.5.5 won't work) Two PPCs is probably the best bet. Say, 9600 and a G4.

In the Windows world, you've seen videos of upgrade marathons going from Windows 1.0 to Windows 7/8. This /may/ be possible on Windows, but it requires 3 architecture swaps on a Mac. Using the same SCSI disk/partition, hopefully, (maybe it requires a disk swap) can you start at 3.2 (the first OS...

Likely the firmware and OS X doesn't support the GPU. Just give up on upgrades. Nothing will be supported, it'll reduce the value of being original, and these weren't meant to be upgraded.

Usually Stuffit just doesn't even try and does nothing but open and close the progress window.

I think you'll need to add some additional hooks for Finder functions. I know Norton Utilities had emergency disks with the Finder replaced to boot right into Utilities.

It'd be nice if we can see pictures of the back and slots.

Yes, but those are niche crazy hacked up boards for crazy people. Apple very likely just adapted a reference Intel one, but from the look of it, just put their branding and serial number on a stock Intel one and called it a day. That's definitely not Apple EFI, after all.

It's closer to C# without semicolons, and most people like to pretend it doesn't exist anymore.

It says DDR RAM, and the timeframe is 2005 (and probably earlier. Much earlier, if the Marklar history is anything to go back) so I'm leaning towards an early 9xx chipset. Sorry kid, no Core 2 for you.

And even then, if you were to look to see if your machine is compromised, look for what? Unless you're a Unix type, you probably have no idea what's going on behind the magic curtain. Not only are they likely to disguise and hide it, they might even use rootkits and hide it even from careful...

The ADP2,1 gets me - is there a first revision?

Except OS X has things like "preemptive multitasking," "memory protection, "interprocess communication" and my favourite, "file system permissions." The extensions have limited hook points and run in their own separate memory space, so the can't bring down the whole system.

Dropbox probably has a bunch of #ifdefs and if(version < 10.something) then DO_HACK() hanging about, which hamper maintainability. They likely want to kill everything pre-Yosemite soon because Yosemite adds an elegant (no memory injections into Finder) way to support third-party sync services.

The problem you'll run into today using old OSes for modern internet services is the lack of decent TLS. SSLv3 got killed because of POODLE, and TLSv1.0 is not long for this world. With a lot of sites tightening up security due to the NSA, expect TLSv1.2 with SNI and modern algorithms only.

I have even more on the start page, and I actually like it.

Let's see what I use on the taskbar! what's missing from 1998. The world has moved on.   Snipping tool: No big deal, just a nice way to crop screenshots. Steam: There's always games for every platform. Every. Control Panel/Explorer: Finder. It does support WebDAV, da? Reader: A decent PDF...

It's not likely going to work. OS X, like the BSDs and to a lesser degree, Windows, have userland and kernel are developed in tandem. It's not expected, that say, the kernel from OpenBSD 5.7 will work on a OpenBSD 4.9 system (or ntoskrnl.exe from 8.1 on XP) due to changes in system calls and...

It lifts? Not far from a Pentium D in benchmarks for single-core perf though.