I don't think it will be that much more expensive because of the complexity. The cost of ICs in these projects is minimal. The flat paddle switches are about 50-60% more expensive than the Altair 8800s, that is where the most expense will be.
Someone has loaned me a complete set of Altair 8800b blank PCBs. I have scanned them all at 3200dpi and 1600dpi. Soon after I am through with the backlog of kits I will start uploading them for people to collect.
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