If you made the box as well, I would... like.... to buy one... =P
I actually did the box about 6 months ago in preparation

At some point soon, It’ll have a manual as well

Does your version have these, and other fixes to make the game more complete? Personally, I wouldn't want a cartridge of an unfinished version, other than for curiosity reasons.:
Can't be ready version as it doesn't exsist yet.
But updating the cart is most likely as easy as chancing one chip.
It would require swapping 2, but it’s entirely doable, not that I like desoldering these old MMC5 boards over and over again. NES PCBs have tiny vias and way thin traces
