Well, anything I can, I guess. I would really like to try playing either one of these games. And if I have to build one to do it...... Did you get to play them? What was it like? Were the holograms high or low quality? Know of any machines for sale? How about a good website describing them. Like I said just anything. These have cluttered my thoughts over the last few days.
If you absolutely must have one then I would recommend waiting for an auction buy.
If you have never played one, I strongly suggest you do so before buying. The Sega Holosseum games all-around bad.. it was really hard to see what was going on (just not designed real well) and the controls and gameplay were non-existant. I don't know what Sega was thinking with this one..
I also had the opportunity to see one firsthand again recently and they are huge. There may be a smaller version, but this one would have required double doors to get it inside.