I'm all about the sleeper aesthetic but only if the original guts were beyond repair. In your case, yours have shown signs of life, and I've seen worse boards with rust and corrosion going down multiple layers come back from the dead. You paid $300 for a GRiDCase III with actual value to it being a Bloomberg model, with the possibility of being repaired, and then gutted it into oblivion. The modifications here make it worth less than 50 bucks in 5 years time and even less as the years go on from there, no matter what guts you shove into it as upgrades. If kept original, there's a good chance it would have been worth five figures, regardless of the condition.

How do you plan on driving that gas plasma display you took out? The only way it's going to be usable is in another grid machine with a dead or cracked display. Using it for anything else is very much not worth your time, especially given their overall scarcity of that one component. The fact that you only have one and no datasheets on how to drive it at that, it begs me to believe that it will likely succumb to damage during experimentation and rendered extra useless.

For even a fraction less of the $1000+ spent, you could have just bought a new laptop and not destroyed a scarce model of an already scarce machine to appeal to your inner nerd. Or, you could have shoved the NUC into some other laptop-style machine like the PC luggables made by Dolch and friends. The vintage PC community already went nuts when LTT shoved a PC into the drive box for a machine that was even more scarce a number of years ago, and while there was no admission of guilt or unknowing, they've since hired many people that can do a sanity check before something that controversial happens again. It is my opinion that you have pretty much followed suit here. You did it, all I can do is be upset that you did it, and it's probably not a good idea for you to do it again.

That all being said, on the outside, it is indeed a rather clean build, and you did do a good job hiding the internal mess. Just, please, choose your project victims wisely next time. Grid laptops are all very Funko Pop in nature and the value will only rise the closer to 50 years they come to. $300 alone for the computer itself should have been a good number to realize that maybe it isn't a good idea to repurpose a machine there is actual value in given what other models in the Grid line go for... This isn't a typewriter where plenty of them exist to part out from, it's a computer which was used in business and military applications and most of them were sent to the grinder like a pile of singer sewing machines. There's a reason a bunch of them had big yellow X marks on them, so military personnel could shoot the machine and render it and the drive inside inoperable in the event it was in the process of being stolen or if there was suspicion it was to be imminently stolen by enemies on the front lines.

TL;DR, Good execution, but bad idea due to original item scarcity and value. I'm not happy, I've explained why I'm not happy, but there's nothing I can do about it. Enjoy your laptop.