You can also do it with NOT gates. The driver needs to overpower the gates to change the bit and then it acts like a D flip flop rather than an RS flip flop like NAND gates will. But that's generally how they're actually made. SRAM generally looks like this: The side transistors are called access transistors; they're there so you can selectively read/write, but aren't needed to store the bit.

yes, tired brain hiccup :)

So here’s some bad math. 160 crabs per NAND gate / byte. Doom’s original file size is roughly 2.39MB (I couldn’t find an actual source for this but it’s touted all over the web).

So 2390000 bytes * 160 crabs is 382400000 crabs.

So you can run doom on 382.4 million crabs

Edit: store, not run

From the paper the picture is of an and gate.
https://wpmedia.wolfram.com/uploads/sites/13/2018/02/20-2-2.pdf