The plastic security mirrors
are first surface mirrors, or at least all the ones I've come across. I have one in the workshop, though it's a bit scratched. Shame I never built anything with it.
I take it you are in Australia? Otherwise I can send it you to play with, if you could cover the postage
If you are in Oz, I am positive you can find one. Look on dome forums, I remember I read a lot of reviews before taking the plunge.
The reason I dropped hemisphere constructions in favour of Cylindrical, is they fill too much and there's not enough floor space for more than one person. Another thing you will discover with extreme warping, text get's blurred. No problem for games, but for museum exhibits and showing real estate projects (one has to pay the bills!) it can be an issue.
Today we tested infinitx with a refined stainless steel mirror array. No warping software, no blending software. Worked a treat
Ok, it was an absolute bitch to calibrate (there I can envy the software approach), but 200 grams of MM's later it was done forever. Must remember to add a bag of MM's with each purchase.
If it looks a bit funky, it's because we set a transparent piece of acrylic in. It's easier when you're adjusting the physical positions of the projectors to be able to see through the screen. If
I look a bit funky, it's coz I'm working 18 hours a day preparing for launch while looking for our next round of funding!
Cheers