Right now if you don't want to spend big bucks for a real antique Altair 8800 but you do want a real S-100 system and not an AltairDuino or Altair Clone, you only have one choice: Buy all the parts separately and build an Altair 8800c. Suppose you only need one .1pf capacitor? Can you buy just one? Not usually. Where do you get this part? Where do you get that part? You'll be ordering from many different sources and have to wait various times for each shipment.
My question is this: Is there enough interest for me to package and sell 8800c kits? You'd only have one thing to order and all the parts would be together in the correct quantities.
I'd be selling the kit at my cost. I don't want to run a business!
Right now I'm only gauging interest. I have no definite plans to do this but if enough people want it, I'll listen to the vox populi.
Feel free to delete this post if it's too commercial or if you have plans to market such a kit.