I must have not done a very good job of explaining the point of the site. The systems are all white, yeah, but that's just part of it. Other white systems like the Intellivision III, SG1000, Mark III, and my old GBA are all white, and will never be included.
The PC Engine had...a spirit, if you will. The shooters, the Kunio games, the chick sims, the SNK fighters, the memory upgrades, the super small developers with some of the most honest, and heartfelt productions...that spirit moved into the Saturn, then the DC, then...died pretty much. There is a bit of it in the PSP, the Xbox (in Japan), and some of it was in the PC-FX (those systems are all availible in white too, btw), but in all honestly it died with Sakura Wars 4 and Ikaruga.
I don't know, maybe I'm imagining this, but all of this seemed pretty obvious to me as it was going down back in the 90s.
As for the OG PC Engine...its kind of redundant. Ultimately the original PC Engine/CDROM2 combo is the most legit, and durable of the systems, but the PC Engine "sprit" didn't really hit its stride until the Duos were released.
As for the site, probably the only thing that will ever change will be the TWL Diary section, which I just added the other day.