I have not been able to locate the nand chips but ill keep looking.
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Nand is just an inverted āandā gate; but remember you can basically build a processor with just and/or (and their inversions) gates; so I think you could build the chip by many different means. How they interface/organize the gates is the magic part. You could build it with an FPGA and CAD tools I guessā¦ But how is beyond me. I just started my first FPGA project at school, with a measly total of 3 gates 
not much exciting tech to be made at that rudimentary levelā¦
Is there no added memory involved with the +drive?
I guess āNANDā here refers to the memory chip technology āNAND-flashā and not the logic gate.
Seems totally doable project as long as the memory chip or technical equivalent is still available.
Unfortunately not. I need to get hold of a +drive and since I started this thread Iāve had an eBay search saved in case someone sells one by itself but in all this time I have not seen one for sale. This means the only option is to buy another Machinedrum that already has a +drive which Iām prepared to do when I have the funds. Unfortunately that wonāt be for a while because I have a lot of expenses this year so will likely be the end of the year/start of next before I can make any progress whatsoever. Itās still my intention to do this but just going to have to wait a bit longer.
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This is the site I found when looking for them way back in 2022
https://www.win-source.net/products/detail/hynix-semiconductor/h26m21001dar.html
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oh dang, that seems too good to be true but ill see about giving it a try. What seemed weird to me about this listing and others for the H26M21001DAR is that i havenāt seen or been able to find a datasheet. even that listing you posted doesnt have it. if any one has one please feel free to share with me.
Maybe asking directly from Elektron?
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Yes found that one me too, but if you open the linked pdf file, it is not a data sheet.
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Defective Md uw appeared on gumtree about 2 mth ago for $400
I was tempted to buy it and install the uw and plus drive.
But thought it better of it - the mucking around and so on.